31221103303120 has 80 divisors (see below), whose sum is σ = 75217401135360. Its totient is φ = 12043607127552.

The previous prime is 31221103303097. The next prime is 31221103303141. The reversal of 31221103303120 is 2130330112213.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 31221103303091 and 31221103303100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57170659 + ... + 57714178.

It is an arithmetic number, because the mean of its divisors is an integer number (940217514192).

Almost surely, 2^{31221103303120} is an apocalyptic number.

It is an amenable number.

31221103303120 is an abundant number, since it is smaller than the sum of its proper divisors (43996297832240).

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

31221103303120 is a wasteful number, since it uses less digits than its factorization.

31221103303120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114884972 (or 114884966 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31221103303120 its reverse (2130330112213), we get a palindrome (33351433415333).

The spelling of 31221103303120 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred three million, three hundred three thousand, one hundred twenty".