21013003312 has 20 divisors (see below), whose sum is σ = 46528793296. Its totient is φ = 9005572800.

The previous prime is 21013003267. The next prime is 21013003337. The reversal of 21013003312 is 21330031012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93807939 + ... + 93808162.

Almost surely, 2^21013003312 is an apocalyptic number.

It is an amenable number.

21013003312 is an abundant number, since it is smaller than the sum of its proper divisors (25515789984).

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

21013003312 is a wasteful number, since it uses less digits than its factorization.

21013003312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187616116 (or 187616110 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21013003312 its reverse (21330031012), we get a palindrome (42343034324).

The spelling of 21013003312 in words is "twenty-one billion, thirteen million, three thousand, three hundred twelve".