21120000010002 has 96 divisors (see below), whose sum is σ = 46364994028080. Its totient is φ = 6947356262400.

The previous prime is 21120000009991. The next prime is 21120000010007. The reversal of 21120000010002 is 20001000002112.

It can be written as a sum of positive squares in 8 ways, for example, as 18880580542041 + 2239419467961 = 4345179^2 + 1496469^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21120000010007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2697658624 + ... + 2697666452.

Almost surely, 2^{21120000010002} is an apocalyptic number.

21120000010002 is an abundant number, since it is smaller than the sum of its proper divisors (25244994018078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120000010002 is a wasteful number, since it uses less digits than its factorization.

21120000010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12188 (or 12185 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21120000010002 its reverse (20001000002112), we get a palindrome (41121000012114).

The spelling of 21120000010002 in words is "twenty-one trillion, one hundred twenty billion, ten thousand, two".