31221130000 has 50 divisors (see below), whose sum is σ = 75589502054. Its totient is φ = 12488448000.

The previous prime is 31221129991. The next prime is 31221130027. The reversal of 31221130000 is 3112213.

It can be written as a sum of positive squares in 5 ways, for example, as 10541539584 + 20679590416 = 102672^2 + 143804^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1551057 + ... + 1571056.

Almost surely, 2^31221130000 is an apocalyptic number.

It is an amenable number.

31221130000 is an abundant number, since it is smaller than the sum of its proper divisors (44368372054).

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

31221130000 is an equidigital number, since it uses as much as digits as its factorization.

31221130000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122141 (or 3122120 counting only the distinct ones).

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

Adding to 31221130000 its reverse (3112213), we get a palindrome (31224242213).

The spelling of 31221130000 in words is "thirty-one billion, two hundred twenty-one million, one hundred thirty thousand".