21012010012 has 24 divisors (see below), whose sum is σ = 42062741504. Its totient is φ = 8996849712.

The previous prime is 21012009971. The next prime is 21012010027. The reversal of 21012010012 is 21001021012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314748 + ... + 375619.

Almost surely, 2^21012010012 is an apocalyptic number.

It is an amenable number.

21012010012 is an abundant number, since it is smaller than the sum of its proper divisors (21050731492).

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

21012010012 is a wasteful number, since it uses less digits than its factorization.

21012010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691465 (or 691463 counting only the distinct ones).

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

Adding to 21012010012 its reverse (21001021012), we get a palindrome (42013031024).

The spelling of 21012010012 in words is "twenty-one billion, twelve million, ten thousand, twelve".