21310032351 has 16 divisors (see below), whose sum is σ = 28934236800. Its totient is φ = 13946912928.

The previous prime is 21310032349. The next prime is 21310032353. The reversal of 21310032351 is 15323001312.

It is an interprime number because it is at equal distance from previous prime (21310032349) and next prime (21310032353).

It is not a de Polignac number, because 21310032351 - 2¹ = 21310032349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310032353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49345 + ... + 212261.

It is an arithmetic number, because the mean of its divisors is an integer number (1808389800).

Almost surely, 2^21310032351 is an apocalyptic number.

21310032351 is a deficient number, since it is larger than the sum of its proper divisors (7624204449).

21310032351 is a wasteful number, since it uses less digits than its factorization.

21310032351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163718.

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 21310032351 its reverse (15323001312), we get a palindrome (36633033663).

The spelling of 21310032351 in words is "twenty-one billion, three hundred ten million, thirty-two thousand, three hundred fifty-one".