21122012002121 has 4 divisors (see below), whose sum is σ = 21141443476992. Its totient is φ = 21102580527252.

The previous prime is 21122012002109. The next prime is 21122012002127. The reversal of 21122012002121 is 12120021022112.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122012002121 is a prime.

It is a super-2 number, since 2×21122012002121² (a number of 27 digits) contains 22 as substring.

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 21122012002121.

It is not an unprimeable number, because it can be changed into a prime (21122012002127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9715735805 + ... + 9715737978.

It is an arithmetic number, because the mean of its divisors is an integer number (5285360869248).

Almost surely, 2^{21122012002121} is an apocalyptic number.

It is an amenable number.

21122012002121 is a deficient number, since it is larger than the sum of its proper divisors (19431474871).

21122012002121 is a wasteful number, since it uses less digits than its factorization.

21122012002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19431474870.

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

Adding to 21122012002121 its reverse (12120021022112), we get a palindrome (33242033024233).

The spelling of 21122012002121 in words is "twenty-one trillion, one hundred twenty-two billion, twelve million, two thousand, one hundred twenty-one".