42220331 has 2 divisors, whose sum is σ = 42220332. Its totient is φ = 42220330.

The previous prime is 42220319. The next prime is 42220349. The reversal of 42220331 is 13302224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42220331 - 2⁶ = 42220267 is a prime.

It is a super-2 number, since 2×42220331² = 3565112699499122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_2560202 and since 42220331 and 2560202 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42220361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110165 + 21110166.

It is an arithmetic number, because the mean of its divisors is an integer number (21110166).

Almost surely, 2^42220331 is an apocalyptic number.

42220331 is a deficient number, since it is larger than the sum of its proper divisors (1).

42220331 is an equidigital number, since it uses as much as digits as its factorization.

42220331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 42220331 is about 6497.7173684302. The cubic root of 42220331 is about 348.2094431075.

Adding to 42220331 its reverse (13302224), we get a palindrome (55522555).

The spelling of 42220331 in words is "forty-two million, two hundred twenty thousand, three hundred thirty-one".