31311321202120 has 32 divisors (see below), whose sum is σ = 70718345248320. Its totient is φ = 12476906695360.

The previous prime is 31311321202093. The next prime is 31311321202159. The reversal of 31311321202120 is 2120212311313.

It is a super-3 number, since 3×31311321202120³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31311321202091 and 31311321202100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488170146 + ... + 1488191185.

It is an arithmetic number, because the mean of its divisors is an integer number (2209948289010).

Almost surely, 2^{31311321202120} is an apocalyptic number.

It is an amenable number.

31311321202120 is an abundant number, since it is smaller than the sum of its proper divisors (39407024046200).

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

31311321202120 is a wasteful number, since it uses less digits than its factorization.

31311321202120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976361605 (or 2976361601 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31311321202120 its reverse (2120212311313), we get a palindrome (33431533513433).

The spelling of 31311321202120 in words is "thirty-one trillion, three hundred eleven billion, three hundred twenty-one million, two hundred two thousand, one hundred twenty".