42220631 has 2 divisors, whose sum is σ = 42220632. Its totient is φ = 42220630.

The previous prime is 42220613. The next prime is 42220637. The reversal of 42220631 is 13602224.

Together with previous prime (42220613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42220631 - 2⁶ = 42220567 is a prime.

It is a super-2 number, since 2×42220631² = 3565163364076322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42220637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110315 + 21110316.

It is an arithmetic number, because the mean of its divisors is an integer number (21110316).

Almost surely, 2^42220631 is an apocalyptic number.

42220631 is a deficient number, since it is larger than the sum of its proper divisors (1).

42220631 is an equidigital number, since it uses as much as digits as its factorization.

42220631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 42220631 is about 6497.7404534192. The cubic root of 42220631 is about 348.2102678491.

Adding to 42220631 its reverse (13602224), we get a palindrome (55822855).

The spelling of 42220631 in words is "forty-two million, two hundred twenty thousand, six hundred thirty-one".