21144326507 has 2 divisors, whose sum is σ = 21144326508. Its totient is φ = 21144326506.

The previous prime is 21144326479. The next prime is 21144326513. The reversal of 21144326507 is 70562344112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21144326507 - 2²⁰ = 21143277931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21144326597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572163253 + 10572163254.

It is an arithmetic number, because the mean of its divisors is an integer number (10572163254).

Almost surely, 2^21144326507 is an apocalyptic number.

21144326507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144326507 is an equidigital number, since it uses as much as digits as its factorization.

21144326507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21144326507 in words is "twenty-one billion, one hundred forty-four million, three hundred twenty-six thousand, five hundred seven".