42210831 has 16 divisors (see below), whose sum is σ = 61296480. Its totient is φ = 25681920.

The previous prime is 42210823. The next prime is 42210851. The reversal of 42210831 is 13801224.

It is not a de Polignac number, because 42210831 - 2³ = 42210823 is a prime.

It is a super-2 number, since 2×42210831² = 3563508507421122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42210798 and 42210807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42210851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2610 + ... + 9551.

It is an arithmetic number, because the mean of its divisors is an integer number (3831030).

Almost surely, 2^42210831 is an apocalyptic number.

42210831 is a deficient number, since it is larger than the sum of its proper divisors (19085649).

42210831 is a wasteful number, since it uses less digits than its factorization.

42210831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12266.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 42210831 is about 6496.9863013554. The cubic root of 42210831 is about 348.1833242703.

The spelling of 42210831 in words is "forty-two million, two hundred ten thousand, eight hundred thirty-one".