31113232120021 has 8 divisors (see below), whose sum is σ = 31166325565760. Its totient is φ = 31060181896128.

The previous prime is 31113232119881. The next prime is 31113232120049. The reversal of 31113232120021 is 12002123231113.

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 31113232120021 - 2¹¹ = 31113232117973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31113232119974 and 31113232120001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113232120921) 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 7 ways as a sum of consecutive naturals, for example, 9364371 + ... + 12244096.

It is an arithmetic number, because the mean of its divisors is an integer number (3895790695720).

Almost surely, 2^{31113232120021} is an apocalyptic number.

It is an amenable number.

31113232120021 is a deficient number, since it is larger than the sum of its proper divisors (53093445739).

31113232120021 is a wasteful number, since it uses less digits than its factorization.

31113232120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21610923.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31113232120021 its reverse (12002123231113), we get a palindrome (43115355351134).

The spelling of 31113232120021 in words is "thirty-one trillion, one hundred thirteen billion, two hundred thirty-two million, one hundred twenty thousand, twenty-one".