21102001012 has 12 divisors (see below), whose sum is σ = 36957383680. Its totient is φ = 10542748536.

The previous prime is 21102001007. The next prime is 21102001031. The reversal of 21102001012 is 21010020112.

It is a self number, because there is not a number n which added to its sum of digits gives 21102001012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057238 + ... + 2067469.

Almost surely, 2^21102001012 is an apocalyptic number.

It is an amenable number.

21102001012 is a deficient number, since it is larger than the sum of its proper divisors (15855382668).

21102001012 is a wasteful number, since it uses less digits than its factorization.

21102001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4125990 (or 4125988 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21102001012 its reverse (21010020112), we get a palindrome (42112021124).

The spelling of 21102001012 in words is "twenty-one billion, one hundred two million, one thousand, twelve".