455408021 has 2 divisors, whose sum is σ = 455408022. Its totient is φ = 455408020.

The previous prime is 455407999. The next prime is 455408039. The reversal of 455408021 is 120804554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451562500 + 3845521 = 21250^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 455408021 - 2¹⁸ = 455145877 is a prime.

It is a super-2 number, since 2×455408021² = 414792931182272882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (455402021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227704010 + 227704011.

It is an arithmetic number, because the mean of its divisors is an integer number (227704011).

Almost surely, 2^455408021 is an apocalyptic number.

It is an amenable number.

455408021 is a deficient number, since it is larger than the sum of its proper divisors (1).

455408021 is an equidigital number, since it uses as much as digits as its factorization.

455408021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 455408021 is about 21340.2910242574. The cubic root of 455408021 is about 769.3670071867.

The spelling of 455408021 in words is "four hundred fifty-five million, four hundred eight thousand, twenty-one".