42213931 has 2 divisors, whose sum is σ = 42213932. Its totient is φ = 42213930.

The previous prime is 42213923. The next prime is 42213959. The reversal of 42213931 is 13931224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42213931 - 2³ = 42213923 is a prime.

It is a super-2 number, since 2×42213931² = 3564031940945522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42213896 and 42213905.

It is not a weakly prime, because it can be changed into another prime (42216931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21106965 + 21106966.

It is an arithmetic number, because the mean of its divisors is an integer number (21106966).

Almost surely, 2^42213931 is an apocalyptic number.

42213931 is a deficient number, since it is larger than the sum of its proper divisors (1).

42213931 is an equidigital number, since it uses as much as digits as its factorization.

42213931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 42213931 is about 6497.2248691268. The cubic root of 42213931 is about 348.1918476900.

The spelling of 42213931 in words is "forty-two million, two hundred thirteen thousand, nine hundred thirty-one".