21309723063 has 12 divisors (see below), whose sum is σ = 31531460688. Its totient is φ = 13859982240.

The previous prime is 21309723041. The next prime is 21309723067. The reversal of 21309723063 is 36032790312.

It is not a de Polignac number, because 21309723063 - 2⁶ = 21309722999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21309723067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28874595 + ... + 28875332.

It is an arithmetic number, because the mean of its divisors is an integer number (2627621724).

Almost surely, 2^21309723063 is an apocalyptic number.

21309723063 is a deficient number, since it is larger than the sum of its proper divisors (10221737625).

21309723063 is a wasteful number, since it uses less digits than its factorization.

21309723063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57749974 (or 57749971 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The spelling of 21309723063 in words is "twenty-one billion, three hundred nine million, seven hundred twenty-three thousand, sixty-three".