21302102131 has 4 divisors (see below), whose sum is σ = 21302486064. Its totient is φ = 21301718200.

The previous prime is 21302102117. The next prime is 21302102209. The reversal of 21302102131 is 13120120312.

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 21302102131 - 2⁵ = 21302102099 is a prime.

It is a super-2 number, since 2×21302102131² (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 (21302102431) 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, 91060 + ... + 225601.

It is an arithmetic number, because the mean of its divisors is an integer number (5325621516).

Almost surely, 2^21302102131 is an apocalyptic number.

21302102131 is a deficient number, since it is larger than the sum of its proper divisors (383933).

21302102131 is an equidigital number, since it uses as much as digits as its factorization.

21302102131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383932.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21302102131 its reverse (13120120312), we get a palindrome (34422222443).

The spelling of 21302102131 in words is "twenty-one billion, three hundred two million, one hundred two thousand, one hundred thirty-one".