421915057 has 2 divisors, whose sum is σ = 421915058. Its totient is φ = 421915056.

The previous prime is 421915009. The next prime is 421915069. The reversal of 421915057 is 750519124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217739536 + 204175521 = 14756^2 + 14289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421915057 is a prime.

It is not a weakly prime, because it can be changed into another prime (421945057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210957528 + 210957529.

It is an arithmetic number, because the mean of its divisors is an integer number (210957529).

Almost surely, 2^421915057 is an apocalyptic number.

It is an amenable number.

421915057 is a deficient number, since it is larger than the sum of its proper divisors (1).

421915057 is an equidigital number, since it uses as much as digits as its factorization.

421915057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 421915057 is about 20540.5709998529. The cubic root of 421915057 is about 750.0237367302.

The spelling of 421915057 in words is "four hundred twenty-one million, nine hundred fifteen thousand, fifty-seven".