447257021 has 2 divisors, whose sum is σ = 447257022. Its totient is φ = 447257020.

The previous prime is 447256981. The next prime is 447257033. The reversal of 447257021 is 120752744.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416731396 + 30525625 = 20414^2 + 5525^2 .

It is a cyclic number.

It is not a de Polignac number, because 447257021 - 2¹⁰ = 447255997 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_23715248 and since 447257021 and 23715248 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447257071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223628510 + 223628511.

It is an arithmetic number, because the mean of its divisors is an integer number (223628511).

Almost surely, 2^447257021 is an apocalyptic number.

It is an amenable number.

447257021 is a deficient number, since it is larger than the sum of its proper divisors (1).

447257021 is an equidigital number, since it uses as much as digits as its factorization.

447257021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 447257021 is about 21148.4519764450. The cubic root of 447257021 is about 764.7492427175.

The spelling of 447257021 in words is "four hundred forty-seven million, two hundred fifty-seven thousand, twenty-one".