21013312308 has 24 divisors (see below), whose sum is σ = 49464968448. Its totient is φ = 6942450816.

The previous prime is 21013312303. The next prime is 21013312339. The reversal of 21013312308 is 80321331012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013312303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7746916 + ... + 7749627.

It is an arithmetic number, because the mean of its divisors is an integer number (2061040352).

Almost surely, 2^21013312308 is an apocalyptic number.

It is an amenable number.

21013312308 is an abundant number, since it is smaller than the sum of its proper divisors (28451656140).

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

21013312308 is a wasteful number, since it uses less digits than its factorization.

21013312308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15496663 (or 15496661 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The spelling of 21013312308 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, three hundred eight".