42420431231 has 2 divisors, whose sum is σ = 42420431232. Its totient is φ = 42420431230.

The previous prime is 42420431203. The next prime is 42420431237. The reversal of 42420431231 is 13213402424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42420431231 - 2²² = 42416236927 is a prime.

It is a super-2 number, since 2×42420431231² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42420431231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42420431237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210215615 + 21210215616.

It is an arithmetic number, because the mean of its divisors is an integer number (21210215616).

Almost surely, 2^42420431231 is an apocalyptic number.

42420431231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420431231 is an equidigital number, since it uses as much as digits as its factorization.

42420431231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 42420431231 its reverse (13213402424), we get a palindrome (55633833655).

The spelling of 42420431231 in words is "forty-two billion, four hundred twenty million, four hundred thirty-one thousand, two hundred thirty-one".