21012313000 has 64 divisors (see below), whose sum is σ = 56192947200. Its totient is φ = 7204219200.

The previous prime is 21012312947. The next prime is 21012313031. The reversal of 21012313000 is 31321012.

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, 1493880 + ... + 1507879.

It is an arithmetic number, because the mean of its divisors is an integer number (878014800).

Almost surely, 2^21012313000 is an apocalyptic number.

21012313000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012313000 is an abundant number, since it is smaller than the sum of its proper divisors (35180634200).

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

21012313000 is a wasteful number, since it uses less digits than its factorization.

21012313000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001787 (or 3001773 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21012313000 its reverse (31321012), we get a palindrome (21043634012).

The spelling of 21012313000 in words is "twenty-one billion, twelve million, three hundred thirteen thousand".