421204457 has 2 divisors, whose sum is σ = 421204458. Its totient is φ = 421204456.

The previous prime is 421204417. The next prime is 421204493. The reversal of 421204457 is 754402124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413674921 + 7529536 = 20339^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 421204457 - 2¹² = 421200361 is a prime.

It is not a weakly prime, because it can be changed into another prime (421204417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210602228 + 210602229.

It is an arithmetic number, because the mean of its divisors is an integer number (210602229).

Almost surely, 2^421204457 is an apocalyptic number.

It is an amenable number.

421204457 is a deficient number, since it is larger than the sum of its proper divisors (1).

421204457 is an equidigital number, since it uses as much as digits as its factorization.

421204457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 421204457 is about 20523.2662361526. The cubic root of 421204457 is about 749.6024304737.

The spelling of 421204457 in words is "four hundred twenty-one million, two hundred four thousand, four hundred fifty-seven".