21310302331 has 4 divisors (see below), whose sum is σ = 21398727064. Its totient is φ = 21221877600.

The previous prime is 21310302241. The next prime is 21310302389. The reversal of 21310302331 is 13320301312.

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 21310302331 - 2¹¹ = 21310300283 is a prime.

It is a super-2 number, since 2×21310302331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21310302299 and 21310302308.

It is not an unprimeable number, because it can be changed into a prime (21310302031) 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, 44212005 + ... + 44212486.

It is an arithmetic number, because the mean of its divisors is an integer number (5349681766).

Almost surely, 2^21310302331 is an apocalyptic number.

21310302331 is a deficient number, since it is larger than the sum of its proper divisors (88424733).

21310302331 is an equidigital number, since it uses as much as digits as its factorization.

21310302331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88424732.

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

Adding to 21310302331 its reverse (13320301312), we get a palindrome (34630603643).

The spelling of 21310302331 in words is "twenty-one billion, three hundred ten million, three hundred two thousand, three hundred thirty-one".