42212431 has 2 divisors, whose sum is σ = 42212432. Its totient is φ = 42212430.

The previous prime is 42212413. The next prime is 42212441. The reversal of 42212431 is 13421224.

Together with previous prime (42212413) 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 42212431 - 2⁵ = 42212399 is a prime.

It is a super-2 number, since 2×42212431² = 3563778661859522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42212399 and 42212408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42212441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21106215 + 21106216.

It is an arithmetic number, because the mean of its divisors is an integer number (21106216).

Almost surely, 2^42212431 is an apocalyptic number.

42212431 is a deficient number, since it is larger than the sum of its proper divisors (1).

42212431 is an equidigital number, since it uses as much as digits as its factorization.

42212431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 19.

The square root of 42212431 is about 6497.1094342023. The cubic root of 42212431 is about 348.1877235068.

Adding to 42212431 its reverse (13421224), we get a palindrome (55633655).

The spelling of 42212431 in words is "forty-two million, two hundred twelve thousand, four hundred thirty-one".