431745021 has 12 divisors (see below), whose sum is σ = 624245440. Its totient is φ = 287546760.

The previous prime is 431745019. The next prime is 431745031. The reversal of 431745021 is 120547134.

It is not a de Polignac number, because 431745021 - 2¹ = 431745019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431745031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13735 + ... + 32436.

Almost surely, 2^431745021 is an apocalyptic number.

It is an amenable number.

431745021 is a deficient number, since it is larger than the sum of its proper divisors (192500419).

431745021 is a wasteful number, since it uses less digits than its factorization.

431745021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47216 (or 47213 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 431745021 is about 20778.4749440376. The cubic root of 431745021 is about 755.8038722358.

The spelling of 431745021 in words is "four hundred thirty-one million, seven hundred forty-five thousand, twenty-one".