42120035131 has 2 divisors, whose sum is σ = 42120035132. Its totient is φ = 42120035130.

The previous prime is 42120035123. The next prime is 42120035137. The reversal of 42120035131 is 13153002124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42120035131 - 2³ = 42120035123 is a prime.

It is a super-2 number, since 2×42120035131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42120035137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060017565 + 21060017566.

It is an arithmetic number, because the mean of its divisors is an integer number (21060017566).

Almost surely, 2^42120035131 is an apocalyptic number.

42120035131 is a deficient number, since it is larger than the sum of its proper divisors (1).

42120035131 is an equidigital number, since it uses as much as digits as its factorization.

42120035131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 42120035131 its reverse (13153002124), we get a palindrome (55273037255).

The spelling of 42120035131 in words is "forty-two billion, one hundred twenty million, thirty-five thousand, one hundred thirty-one".