21313232132251 has 2 divisors, whose sum is σ = 21313232132252. Its totient is φ = 21313232132250.

The previous prime is 21313232132249. The next prime is 21313232132261. The reversal of 21313232132251 is 15223123231312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313232132251 - 2¹ = 21313232132249 is a prime.

Together with 21313232132249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21313232132261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656616066125 + 10656616066126.

It is an arithmetic number, because the mean of its divisors is an integer number (10656616066126).

Almost surely, 2^{21313232132251} is an apocalyptic number.

21313232132251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313232132251 is an equidigital number, since it uses as much as digits as its factorization.

21313232132251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

Adding to 21313232132251 its reverse (15223123231312), we get a palindrome (36536355363563).

The spelling of 21313232132251 in words is "twenty-one trillion, three hundred thirteen billion, two hundred thirty-two million, one hundred thirty-two thousand, two hundred fifty-one".