42213531 has 16 divisors (see below), whose sum is σ = 58406400. Its totient is φ = 27087648.

The previous prime is 42213517. The next prime is 42213553. The reversal of 42213531 is 13531224.

It is not a de Polignac number, because 42213531 - 2⁶ = 42213467 is a prime.

It is a super-2 number, since 2×42213531² = 3563964398975922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42213498 and 42213507.

It is not an unprimeable number, because it can be changed into a prime (42213511) 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, 40110 + ... + 41148.

It is an arithmetic number, because the mean of its divisors is an integer number (3650400).

Almost surely, 2^42213531 is an apocalyptic number.

42213531 is a deficient number, since it is larger than the sum of its proper divisors (16192869).

42213531 is a wasteful number, since it uses less digits than its factorization.

42213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538.

The product of its digits is 720, while the sum is 21.

The square root of 42213531 is about 6497.1940866808. The cubic root of 42213531 is about 348.1907479174.

Adding to 42213531 its reverse (13531224), we get a palindrome (55744755).

The spelling of 42213531 in words is "forty-two million, two hundred thirteen thousand, five hundred thirty-one".