21001210021012 has 48 divisors (see below), whose sum is σ = 40828461866752. Its totient is φ = 9391668612480.

The previous prime is 21001210020983. The next prime is 21001210021037. The reversal of 21001210021012 is 21012001210012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21001210020983 and 21001210021001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49196508 + ... + 49621555.

Almost surely, 2^{21001210021012} is an apocalyptic number.

It is an amenable number.

21001210021012 is a deficient number, since it is larger than the sum of its proper divisors (19827251845740).

21001210021012 is a wasteful number, since it uses less digits than its factorization.

21001210021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98818208 (or 98818206 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001210021012 its reverse (21012001210012), we get a palindrome (42013211231024).

The spelling of 21001210021012 in words is "twenty-one trillion, one billion, two hundred ten million, twenty-one thousand, twelve".