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BaseRepresentation
bin111000010110001001…
…0011101100000000101
3102120022211211122101020
41300230102131200011
53440303020334341
6131330531221353
711512355026422
oct1605422354005
9376284748336
10121002121221
11473535a7683
121b54b447859
13b5449b7bc7
145bdc486d49
153232e55566
hex1c2c49d805

121002121221 has 4 divisors (see below), whose sum is σ = 161336161632. Its totient is φ = 80668080812.

The previous prime is 121002121213. The next prime is 121002121277. The reversal of 121002121221 is 122121200121.

Adding to 121002121221 its reverse (122121200121), we get a palindrome (243123321342).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122121200121 = 340707066707.

It is a cyclic number.

It is not a de Polignac number, because 121002121221 - 23 = 121002121213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121002121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002122221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20167020201 + ... + 20167020206.

It is an arithmetic number, because the mean of its divisors is an integer number (40334040408).

Almost surely, 2121002121221 is an apocalyptic number.

It is an amenable number.

121002121221 is a deficient number, since it is larger than the sum of its proper divisors (40334040411).

121002121221 is an equidigital number, since it uses as much as digits as its factorization.

121002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40334040410.

The product of its (nonzero) digits is 32, while the sum is 15.

The spelling of 121002121221 in words is "one hundred twenty-one billion, two million, one hundred twenty-one thousand, two hundred twenty-one".

Divisors: 1 3 40334040407 121002121221