21302232131 has 2 divisors, whose sum is σ = 21302232132. Its totient is φ = 21302232130.

The previous prime is 21302232103. The next prime is 21302232151. The reversal of 21302232131 is 13123220312.

It is an a-pointer prime, because the next prime (21302232151) can be obtained adding 21302232131 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302232131 is a prime.

It is a super-2 number, since 2×21302232131² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21302232151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651116065 + 10651116066.

It is an arithmetic number, because the mean of its divisors is an integer number (10651116066).

Almost surely, 2^21302232131 is an apocalyptic number.

21302232131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302232131 is an equidigital number, since it uses as much as digits as its factorization.

21302232131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21302232131 its reverse (13123220312), we get a palindrome (34425452443).

The spelling of 21302232131 in words is "twenty-one billion, three hundred two million, two hundred thirty-two thousand, one hundred thirty-one".