21331322068 has 24 divisors (see below), whose sum is σ = 43703198784. Its totient is φ = 8919019200.

The previous prime is 21331322017. The next prime is 21331322069. The reversal of 21331322068 is 86022313312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331322069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9289498 + ... + 9291793.

It is an arithmetic number, because the mean of its divisors is an integer number (1820966616).

Almost surely, 2^21331322068 is an apocalyptic number.

21331322068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21331322068 is an abundant number, since it is smaller than the sum of its proper divisors (22371876716).

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

21331322068 is a wasteful number, since it uses less digits than its factorization.

21331322068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18581343 (or 18581341 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21331322068 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, sixty-eight".