21302110331 has 2 divisors, whose sum is σ = 21302110332. Its totient is φ = 21302110330.

The previous prime is 21302110289. The next prime is 21302110339. The reversal of 21302110331 is 13301120312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302110331 is a prime.

It is a super-2 number, since 2×21302110331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21302110339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651055165 + 10651055166.

It is an arithmetic number, because the mean of its divisors is an integer number (10651055166).

Almost surely, 2^21302110331 is an apocalyptic number.

21302110331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302110331 is an equidigital number, since it uses as much as digits as its factorization.

21302110331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21302110331 its reverse (13301120312), we get a palindrome (34603230643).

The spelling of 21302110331 in words is "twenty-one billion, three hundred two million, one hundred ten thousand, three hundred thirty-one".