31021100022 has 64 divisors (see below), whose sum is σ = 69119930880. Its totient is φ = 9201504000.

The previous prime is 31021100021. The next prime is 31021100029. The reversal of 31021100022 is 22000112013.

It is a junction number, because it is equal to n+sod(n) for n = 31021099980 and 31021100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021100021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1525522 + ... + 1545722.

It is an arithmetic number, because the mean of its divisors is an integer number (1079998920).

Almost surely, 2^31021100022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31021100022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34559965440).

31021100022 is an abundant number, since it is smaller than the sum of its proper divisors (38098830858).

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

31021100022 is a wasteful number, since it uses less digits than its factorization.

31021100022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20709.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 31021100022 its reverse (22000112013), we get a palindrome (53021212035).

The spelling of 31021100022 in words is "thirty-one billion, twenty-one million, one hundred thousand, twenty-two".