31113133021 has 8 divisors (see below), whose sum is σ = 31641539544. Its totient is φ = 30585318720.

The previous prime is 31113133001. The next prime is 31113133063. The reversal of 31113133021 is 12033131113.

It can be written as a sum of positive squares in 4 ways, for example, as 309372921 + 30803760100 = 17589^2 + 175510^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31113133021 - 2⁷ = 31113132893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31113133021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113133001) 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, 41446 + ... + 252871.

It is an arithmetic number, because the mean of its divisors is an integer number (3955192443).

Almost surely, 2^31113133021 is an apocalyptic number.

It is an amenable number.

31113133021 is a deficient number, since it is larger than the sum of its proper divisors (528406523).

31113133021 is a wasteful number, since it uses less digits than its factorization.

31113133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296111.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31113133021 its reverse (12033131113), we get a palindrome (43146264134).

The spelling of 31113133021 in words is "thirty-one billion, one hundred thirteen million, one hundred thirty-three thousand, twenty-one".