421043731857 has 32 divisors (see below), whose sum is σ = 713910159360. Its totient is φ = 240248157840.

The previous prime is 421043731841. The next prime is 421043731861. The reversal of 421043731857 is 758137340124.

421043731857 is a `hidden beast` number, since 4 + 210 + 4 + 373 + 18 + 57 = 666.

It is not a de Polignac number, because 421043731857 - 2⁴ = 421043731841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421043731837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1481373 + ... + 1742570.

It is an arithmetic number, because the mean of its divisors is an integer number (22309692480).

Almost surely, 2^421043731857 is an apocalyptic number.

It is an amenable number.

421043731857 is a deficient number, since it is larger than the sum of its proper divisors (292866427503).

421043731857 is a wasteful number, since it uses less digits than its factorization.

421043731857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224650 (or 3224644 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 421043731857 in words is "four hundred twenty-one billion, forty-three million, seven hundred thirty-one thousand, eight hundred fifty-seven".