31120143021 has 12 divisors (see below), whose sum is σ = 49037801280. Its totient is φ = 18860692680.

The previous prime is 31120143013. The next prime is 31120143037. The reversal of 31120143021 is 12034102113.

31120143021 is a `hidden beast` number, since 3 + 11 + 201 + 430 + 21 = 666.

It is not a de Polignac number, because 31120143021 - 2³ = 31120143013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31120142985 and 31120143003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120143091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157172341 + ... + 157172538.

It is an arithmetic number, because the mean of its divisors is an integer number (4086483440).

Almost surely, 2^31120143021 is an apocalyptic number.

It is an amenable number.

31120143021 is a deficient number, since it is larger than the sum of its proper divisors (17917658259).

31120143021 is a wasteful number, since it uses less digits than its factorization.

31120143021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314344896 (or 314344893 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31120143021 its reverse (12034102113), we get a palindrome (43154245134).

The spelling of 31120143021 in words is "thirty-one billion, one hundred twenty million, one hundred forty-three thousand, twenty-one".