31321011020 has 96 divisors (see below), whose sum is σ = 71856046080. Its totient is φ = 11398809600.

The previous prime is 31321011019. The next prime is 31321011049. The reversal of 31321011020 is 2011012313.

It is a super-2 number, since 2×31321011020² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31321010986 and 31321011004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6116021 + ... + 6121139.

It is an arithmetic number, because the mean of its divisors is an integer number (748500480).

Almost surely, 2^31321011020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31321011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35928023040).

31321011020 is an abundant number, since it is smaller than the sum of its proper divisors (40535035060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31321011020 is a wasteful number, since it uses less digits than its factorization.

31321011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475 (or 5473 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31321011020 its reverse (2011012313), we get a palindrome (33332023333).

The spelling of 31321011020 in words is "thirty-one billion, three hundred twenty-one million, eleven thousand, twenty".