42156312131 has 4 divisors (see below), whose sum is σ = 42159207672. Its totient is φ = 42153416592.

The previous prime is 42156312101. The next prime is 42156312161. The reversal of 42156312131 is 13121365124.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42156312101) and next prime (42156312161).

It is a cyclic number.

It is not a de Polignac number, because 42156312131 - 2⁶ = 42156312067 is a prime.

It is a super-2 number, since 2×42156312131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42156312094 and 42156312103.

It is not an unprimeable number, because it can be changed into a prime (42156312101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1425821 + ... + 1455086.

It is an arithmetic number, because the mean of its divisors is an integer number (10539801918).

Almost surely, 2^42156312131 is an apocalyptic number.

42156312131 is a deficient number, since it is larger than the sum of its proper divisors (2895541).

42156312131 is a wasteful number, since it uses less digits than its factorization.

42156312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895540.

The product of its digits is 4320, while the sum is 29.

Adding to 42156312131 its reverse (13121365124), we get a palindrome (55277677255).

The spelling of 42156312131 in words is "forty-two billion, one hundred fifty-six million, three hundred twelve thousand, one hundred thirty-one".