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11122222121 = 181386315907
BaseRepresentation
bin10100101101110111…
…11010010000101001
31001201010102102110122
422112323322100221
5140234242101441
65035351453025
7542422220363
oct122673722051
931633372418
1011122222121
11479822810a
1221a4987175
13108334bb2a
14777207d33
1545168334b
hex296efa429

11122222121 has 8 divisors (see below), whose sum is σ = 11187269184. Its totient is φ = 11057214960.

The previous prime is 11122222099. The next prime is 11122222157. The reversal of 11122222121 is 12122222111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11122222121 - 26 = 11122222057 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 11122222121.

It is not an unprimeable number, because it can be changed into a prime (11122222021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691250 + ... + 707156.

It is an arithmetic number, because the mean of its divisors is an integer number (1398408648).

Almost surely, 211122222121 is an apocalyptic number.

It is an amenable number.

11122222121 is a deficient number, since it is larger than the sum of its proper divisors (65047063).

11122222121 is a wasteful number, since it uses less digits than its factorization.

11122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19951.

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

Adding to 11122222121 its reverse (12122222111), we get a palindrome (23244444232).

The spelling of 11122222121 in words is "eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".

Divisors: 1 181 3863 15907 699203 2879167 61448741 11122222121