421522457 has 2 divisors, whose sum is σ = 421522458. Its totient is φ = 421522456.

The previous prime is 421522447. The next prime is 421522471. The reversal of 421522457 is 754225124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212459776 + 209062681 = 14576^2 + 14459^2 .

It is a cyclic number.

It is not a de Polignac number, because 421522457 - 2²⁰ = 420473881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421522417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210761228 + 210761229.

It is an arithmetic number, because the mean of its divisors is an integer number (210761229).

Almost surely, 2^421522457 is an apocalyptic number.

It is an amenable number.

421522457 is a deficient number, since it is larger than the sum of its proper divisors (1).

421522457 is an equidigital number, since it uses as much as digits as its factorization.

421522457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 32.

The square root of 421522457 is about 20531.0120792912. The cubic root of 421522457 is about 749.7910274090.

The spelling of 421522457 in words is "four hundred twenty-one million, five hundred twenty-two thousand, four hundred fifty-seven".