31321201021 has 48 divisors (see below), whose sum is σ = 35811175680. Its totient is φ = 27358531200.

The previous prime is 31321201019. The next prime is 31321201099. The reversal of 31321201021 is 12010212313.

It is not a de Polignac number, because 31321201021 - 2¹ = 31321201019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31321200986 and 31321201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321201621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106898151 + ... + 106898443.

It is an arithmetic number, because the mean of its divisors is an integer number (746066160).

Almost surely, 2^31321201021 is an apocalyptic number.

It is an amenable number.

31321201021 is a deficient number, since it is larger than the sum of its proper divisors (4489974659).

31321201021 is a wasteful number, since it uses less digits than its factorization.

31321201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31321201021 its reverse (12010212313), we get a palindrome (43331413334).

The spelling of 31321201021 in words is "thirty-one billion, three hundred twenty-one million, two hundred one thousand, twenty-one".