31121303020 has 96 divisors (see below), whose sum is σ = 69068018880. Its totient is φ = 11762150400.

The previous prime is 31121302951. The next prime is 31121303021. The reversal of 31121303020 is 2030312113.

It is a super-2 number, since 2×31121303020² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31121302985 and 31121303003.

It is not an unprimeable number, because it can be changed into a prime (31121303021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6098470 + ... + 6103570.

It is an arithmetic number, because the mean of its divisors is an integer number (719458530).

Almost surely, 2^31121303020 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 31121303020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34534009440).

31121303020 is an abundant number, since it is smaller than the sum of its proper divisors (37946715860).

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

31121303020 is a wasteful number, since it uses less digits than its factorization.

31121303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5363 (or 5361 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31121303020 its reverse (2030312113), we get a palindrome (33151615133).

The spelling of 31121303020 in words is "thirty-one billion, one hundred twenty-one million, three hundred three thousand, twenty".