21021002001012 has 24 divisors (see below), whose sum is σ = 52822005028576. Its totient is φ = 6468000615648.

The previous prime is 21021002001001. The next prime is 21021002001017. The reversal of 21021002001012 is 21010020012012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021002001017) 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, 67375006258 + ... + 67375006569.

Almost surely, 2^{21021002001012} is an apocalyptic number.

It is an amenable number.

21021002001012 is an abundant number, since it is smaller than the sum of its proper divisors (31801003027564).

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

21021002001012 is a wasteful number, since it uses less digits than its factorization.

21021002001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134750012847 (or 134750012845 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021002001012 its reverse (21010020012012), we get a palindrome (42031022013024).

The spelling of 21021002001012 in words is "twenty-one trillion, twenty-one billion, two million, one thousand, twelve".