31021013020 has 12 divisors (see below), whose sum is σ = 65144127384. Its totient is φ = 12408405200.

The previous prime is 31021012951. The next prime is 31021013027. The reversal of 31021013020 is 2031012013.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021013027) 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 3 ways as a sum of consecutive naturals, for example, 775525306 + ... + 775525345.

It is an arithmetic number, because the mean of its divisors is an integer number (5428677282).

Almost surely, 2^31021013020 is an apocalyptic number.

It is an amenable number.

31021013020 is an abundant number, since it is smaller than the sum of its proper divisors (34123114364).

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

31021013020 is a wasteful number, since it uses less digits than its factorization.

31021013020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551050660 (or 1551050658 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31021013020 its reverse (2031012013), we get a palindrome (33052025033).

The spelling of 31021013020 in words is "thirty-one billion, twenty-one million, thirteen thousand, twenty".