457521421 has 8 divisors (see below), whose sum is σ = 523046720. Its totient is φ = 392037408.

The previous prime is 457521413. The next prime is 457521431. The reversal of 457521421 is 124125754.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 457521421 - 2³ = 457521413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (457521401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18985 + ... + 35713.

It is an arithmetic number, because the mean of its divisors is an integer number (65380840).

Almost surely, 2^457521421 is an apocalyptic number.

It is an amenable number.

457521421 is a deficient number, since it is larger than the sum of its proper divisors (65525299).

457521421 is a wasteful number, since it uses less digits than its factorization.

457521421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20643.

The product of its digits is 11200, while the sum is 31.

The square root of 457521421 is about 21389.7503725499. The cubic root of 457521421 is about 770.5552979855. Note that the first 3 decimals are identical.

The spelling of 457521421 in words is "four hundred fifty-seven million, five hundred twenty-one thousand, four hundred twenty-one".