21239402968 has 32 divisors (see below), whose sum is σ = 45533302560. Its totient is φ = 9098542080.

The previous prime is 21239402963. The next prime is 21239402971. The reversal of 21239402968 is 86920493212.

It is a super-2 number, since 2×21239402968² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21239402963) 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, 43858 + ... + 210718.

It is an arithmetic number, because the mean of its divisors is an integer number (1422915705).

Almost surely, 2^21239402968 is an apocalyptic number.

21239402968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21239402968 is an abundant number, since it is smaller than the sum of its proper divisors (24293899592).

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

21239402968 is a wasteful number, since it uses less digits than its factorization.

21239402968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169147 (or 169143 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 21239402968 in words is "twenty-one billion, two hundred thirty-nine million, four hundred two thousand, nine hundred sixty-eight".