21002200121121 has 32 divisors (see below), whose sum is σ = 28244351808000. Its totient is φ = 13881131746560.

The previous prime is 21002200121113. The next prime is 21002200121251. The reversal of 21002200121121 is 12112100220012.

It is not a de Polignac number, because 21002200121121 - 2³ = 21002200121113 is a prime.

It is a super-2 number, since 2×21002200121121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21002200121121.

It is not an unprimeable number, because it can be changed into a prime (21002200121521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 793151160 + ... + 793177638.

It is an arithmetic number, because the mean of its divisors is an integer number (882635994000).

Almost surely, 2^{21002200121121} is an apocalyptic number.

It is an amenable number.

21002200121121 is a deficient number, since it is larger than the sum of its proper divisors (7242151686879).

21002200121121 is a wasteful number, since it uses less digits than its factorization.

21002200121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29929.

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

Adding to 21002200121121 its reverse (12112100220012), we get a palindrome (33114300341133).

The spelling of 21002200121121 in words is "twenty-one trillion, two billion, two hundred million, one hundred twenty-one thousand, one hundred twenty-one".