21131032313 has 4 divisors (see below), whose sum is σ = 21133271040. Its totient is φ = 21128793588.

The previous prime is 21131032301. The next prime is 21131032357. The reversal of 21131032313 is 31323013112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21131032313 - 2²⁸ = 20862596857 is a prime.

It is a super-2 number, since 2×21131032313² (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 (21131032393) 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, 1105145 + ... + 1124102.

It is an arithmetic number, because the mean of its divisors is an integer number (5283317760).

Almost surely, 2^21131032313 is an apocalyptic number.

It is an amenable number.

21131032313 is a deficient number, since it is larger than the sum of its proper divisors (2238727).

21131032313 is an equidigital number, since it uses as much as digits as its factorization.

21131032313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238726.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21131032313 its reverse (31323013112), we get a palindrome (52454045425).

The spelling of 21131032313 in words is "twenty-one billion, one hundred thirty-one million, thirty-two thousand, three hundred thirteen".