31103201311220 has 96 divisors (see below), whose sum is σ = 67111527974400. Its totient is φ = 12104427484800.

The previous prime is 31103201311181. The next prime is 31103201311249. The reversal of 31103201311220 is 2211310230113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31103201311192 and 31103201311201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44218475 + ... + 44916365.

It is an arithmetic number, because the mean of its divisors is an integer number (699078416400).

Almost surely, 2^{31103201311220} is an apocalyptic number.

It is an amenable number.

31103201311220 is an abundant number, since it is smaller than the sum of its proper divisors (36008326663180).

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

31103201311220 is a wasteful number, since it uses less digits than its factorization.

31103201311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698349 (or 698347 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31103201311220 its reverse (2211310230113), we get a palindrome (33314511541333).

The spelling of 31103201311220 in words is "thirty-one trillion, one hundred three billion, two hundred one million, three hundred eleven thousand, two hundred twenty".