21310032313 has 4 divisors (see below), whose sum is σ = 21325554468. Its totient is φ = 21294510160.

The previous prime is 21310032311. The next prime is 21310032349. The reversal of 21310032313 is 31323001312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13362666409 + 7947365904 = 115597^2 + 89148^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310032313 - 2¹ = 21310032311 is a prime.

It is a super-2 number, since 2×21310032313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310032311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7759018 + ... + 7761763.

It is an arithmetic number, because the mean of its divisors is an integer number (5331388617).

Almost surely, 2^21310032313 is an apocalyptic number.

It is an amenable number.

21310032313 is a deficient number, since it is larger than the sum of its proper divisors (15522155).

21310032313 is a wasteful number, since it uses less digits than its factorization.

21310032313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15522154.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21310032313 its reverse (31323001312), we get a palindrome (52633033625).

The spelling of 21310032313 in words is "twenty-one billion, three hundred ten million, thirty-two thousand, three hundred thirteen".