31021010020 has 96 divisors (see below), whose sum is σ = 87466288896. Its totient is φ = 8925120000.

The previous prime is 31021010011. The next prime is 31021010023. The reversal of 31021010020 is 2001012013.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 31021009979 and 31021010006.

It is not an unprimeable number, because it can be changed into a prime (31021010023) 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 31 ways as a sum of consecutive naturals, for example, 754731 + ... + 794770.

It is an arithmetic number, because the mean of its divisors is an integer number (911107176).

Almost surely, 2^31021010020 is an apocalyptic number.

It is an amenable number.

31021010020 is an abundant number, since it is smaller than the sum of its proper divisors (56445278876).

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

31021010020 is a wasteful number, since it uses less digits than its factorization.

31021010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549541 (or 1549539 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 31021010020 its reverse (2001012013), we get a palindrome (33022022033).

The spelling of 31021010020 in words is "thirty-one billion, twenty-one million, ten thousand, twenty".