21302012131 has 2 divisors, whose sum is σ = 21302012132. Its totient is φ = 21302012130.

The previous prime is 21302012063. The next prime is 21302012191. The reversal of 21302012131 is 13121020312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21302012131 - 2¹³ = 21302003939 is a prime.

It is a super-2 number, since 2×21302012131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21302012191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651006065 + 10651006066.

It is an arithmetic number, because the mean of its divisors is an integer number (10651006066).

Almost surely, 2^21302012131 is an apocalyptic number.

21302012131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302012131 is an equidigital number, since it uses as much as digits as its factorization.

21302012131 is an evil number, because the sum of its binary digits is even.

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

Adding to 21302012131 its reverse (13121020312), we get a palindrome (34423032443).

The spelling of 21302012131 in words is "twenty-one billion, three hundred two million, twelve thousand, one hundred thirty-one".