31320233021 has 36 divisors (see below), whose sum is σ = 40179785184. Its totient is φ = 24324466320.

The previous prime is 31320233011. The next prime is 31320233057. The reversal of 31320233021 is 12033202313.

It is not a de Polignac number, because 31320233021 - 2²² = 31316038717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31320232984 and 31320233002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320233011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1811600 + ... + 1828806.

It is an arithmetic number, because the mean of its divisors is an integer number (1116105144).

Almost surely, 2^31320233021 is an apocalyptic number.

It is an amenable number.

31320233021 is a deficient number, since it is larger than the sum of its proper divisors (8859552163).

31320233021 is a wasteful number, since it uses less digits than its factorization.

31320233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17550 (or 17532 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31320233021 its reverse (12033202313), we get a palindrome (43353435334).

The spelling of 31320233021 in words is "thirty-one billion, three hundred twenty million, two hundred thirty-three thousand, twenty-one".