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22112122121 = 22273992777
BaseRepresentation
bin10100100101111111…
…000011010100001001
32010002000212012002222
4110211333003110021
5330241200401441
614054055303425
71411646636225
oct244577032411
963060765088
1022112122121
1194177976a1
12435137ab75
13211514b23b
1410daa09785
158963c9d4b
hex525fc3509

22112122121 has 4 divisors (see below), whose sum is σ = 22113137172. Its totient is φ = 22111107072.

The previous prime is 22112122111. The next prime is 22112122127. The reversal of 22112122121 is 12122121122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12122121122 = 26061060561.

It can be written as a sum of positive squares in 2 ways, for example, as 2967525625 + 19144596496 = 54475^2 + 138364^2 .

It is a cyclic number.

It is not a de Polignac number, because 22112122121 - 214 = 22112105737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22112122121.

It is not an unprimeable number, because it can be changed into a prime (22112122127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474116 + ... + 518661.

It is an arithmetic number, because the mean of its divisors is an integer number (5528284293).

Almost surely, 222112122121 is an apocalyptic number.

It is an amenable number.

22112122121 is a deficient number, since it is larger than the sum of its proper divisors (1015051).

22112122121 is an equidigital number, since it uses as much as digits as its factorization.

22112122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015050.

The product of its digits is 64, while the sum is 17.

Adding to 22112122121 its reverse (12122121122), we get a palindrome (34234243243).

Subtracting from 22112122121 its reverse (12122121122), we obtain a palindrome (9990000999).

The spelling of 22112122121 in words is "twenty-two billion, one hundred twelve million, one hundred twenty-two thousand, one hundred twenty-one".

Divisors: 1 22273 992777 22112122121