31113011021 has 8 divisors (see below), whose sum is σ = 32713512600. Its totient is φ = 29547685440.

The previous prime is 31113011009. The next prime is 31113011051. The reversal of 31113011021 is 12011031113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 990025 + 31112020996 = 995^2 + 176386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31113011021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31113010987 and 31113011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113011051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8792186 + ... + 8795723.

It is an arithmetic number, because the mean of its divisors is an integer number (4089189075).

Almost surely, 2^31113011021 is an apocalyptic number.

It is an amenable number.

31113011021 is a deficient number, since it is larger than the sum of its proper divisors (1600501579).

31113011021 is a wasteful number, since it uses less digits than its factorization.

31113011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17587999.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 31113011021 its reverse (12011031113), we get a palindrome (43124042134).

The spelling of 31113011021 in words is "thirty-one billion, one hundred thirteen million, eleven thousand, twenty-one".