31120204242 has 16 divisors (see below), whose sum is σ = 62470081152. Its totient is φ = 10335122640.

The previous prime is 31120204229. The next prime is 31120204261. The reversal of 31120204242 is 24240202113.

It is a super-2 number, since 2×31120204242² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9567933 + ... + 9571184.

It is an arithmetic number, because the mean of its divisors is an integer number (3904380072).

Almost surely, 2^31120204242 is an apocalyptic number.

31120204242 is an abundant number, since it is smaller than the sum of its proper divisors (31349876910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31120204242 is a wasteful number, since it uses less digits than its factorization.

31120204242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19139393.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 31120204242 its reverse (24240202113), we get a palindrome (55360406355).

The spelling of 31120204242 in words is "thirty-one billion, one hundred twenty million, two hundred four thousand, two hundred forty-two".