21310223139 has 6 divisors (see below), whose sum is σ = 30781433436. Its totient is φ = 14206815420.

The previous prime is 21310223131. The next prime is 21310223153. The reversal of 21310223139 is 93132201312.

It is not a de Polignac number, because 21310223139 - 2³ = 21310223131 is a prime.

It is a super-2 number, since 2×21310223139² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21310223131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183901277 + ... + 1183901294.

It is an arithmetic number, because the mean of its divisors is an integer number (5130238906).

Almost surely, 2^21310223139 is an apocalyptic number.

21310223139 is a deficient number, since it is larger than the sum of its proper divisors (9471210297).

21310223139 is a wasteful number, since it uses less digits than its factorization.

21310223139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367802577 (or 2367802574 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 21310223139 in words is "twenty-one billion, three hundred ten million, two hundred twenty-three thousand, one hundred thirty-nine".