431465138690021 has 2 divisors, whose sum is σ = 431465138690022. Its totient is φ = 431465138690020.

The previous prime is 431465138689933. The next prime is 431465138690143. The reversal of 431465138690021 is 120096831564134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337824951400225 + 93640187289796 = 18380015^2 + 9676786^2 .

It is a cyclic number.

It is not a de Polignac number, because 431465138690021 - 2²⁶ = 431465071581157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431465138390021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215732569345010 + 215732569345011.

It is an arithmetic number, because the mean of its divisors is an integer number (215732569345011).

Almost surely, 2^{431465138690021} is an apocalyptic number.

It is an amenable number.

431465138690021 is a deficient number, since it is larger than the sum of its proper divisors (1).

431465138690021 is an equidigital number, since it uses as much as digits as its factorization.

431465138690021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 431465138690021 in words is "four hundred thirty-one trillion, four hundred sixty-five billion, one hundred thirty-eight million, six hundred ninety thousand, twenty-one".