21310139359 has 4 divisors (see below), whose sum is σ = 21310593120. Its totient is φ = 21309685600.

The previous prime is 21310139351. The next prime is 21310139363. The reversal of 21310139359 is 95393101312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21310139359 - 2³ = 21310139351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310139351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147079 + ... + 253480.

It is an arithmetic number, because the mean of its divisors is an integer number (5327648280).

Almost surely, 2^21310139359 is an apocalyptic number.

21310139359 is a deficient number, since it is larger than the sum of its proper divisors (453761).

21310139359 is an equidigital number, since it uses as much as digits as its factorization.

21310139359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453760.

The product of its (nonzero) digits is 21870, while the sum is 37.

The spelling of 21310139359 in words is "twenty-one billion, three hundred ten million, one hundred thirty-nine thousand, three hundred fifty-nine".