21021210020012 has 24 divisors (see below), whose sum is σ = 38386729634400. Its totient is φ = 10053577081856.

The previous prime is 21021210019993. The next prime is 21021210020051. The reversal of 21021210020012 is 21002001212012.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29793164 + ... + 30490572.

It is an arithmetic number, because the mean of its divisors is an integer number (1599447068100).

Almost surely, 2^{21021210020012} is an apocalyptic number.

It is an amenable number.

21021210020012 is a deficient number, since it is larger than the sum of its proper divisors (17365519614388).

21021210020012 is a wasteful number, since it uses less digits than its factorization.

21021210020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025065 (or 1025063 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021210020012 its reverse (21002001212012), we get a palindrome (42023211232024).

The spelling of 21021210020012 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, twenty thousand, twelve".