31121001424 has 20 divisors (see below), whose sum is σ = 61122928036. Its totient is φ = 15347342592.

The previous prime is 31121001421. The next prime is 31121001451. The reversal of 31121001424 is 42410012113.

It can be written as a sum of positive squares in 2 ways, for example, as 6220161424 + 24900840000 = 78868^2 + 157800^2 .

It is a super-2 number, since 2×31121001424² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121001421) 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, 13321179 + ... + 13323514.

Almost surely, 2^31121001424 is an apocalyptic number.

It is an amenable number.

31121001424 is a deficient number, since it is larger than the sum of its proper divisors (30001926612).

31121001424 is a wasteful number, since it uses less digits than its factorization.

31121001424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26644774 (or 26644768 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 31121001424 its reverse (42410012113), we get a palindrome (73531013537).

The spelling of 31121001424 in words is "thirty-one billion, one hundred twenty-one million, one thousand, four hundred twenty-four".