31103213031220 has 48 divisors (see below), whose sum is σ = 73553170070016. Its totient is φ = 10945412208000.

The previous prime is 31103213031133. The next prime is 31103213031227. The reversal of 31103213031220 is 2213031230113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31103213031191 and 31103213031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103213031227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2280287391 + ... + 2280301030.

It is an arithmetic number, because the mean of its divisors is an integer number (1532357709792).

Almost surely, 2^{31103213031220} is an apocalyptic number.

It is an amenable number.

31103213031220 is an abundant number, since it is smaller than the sum of its proper divisors (42449957038796).

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

31103213031220 is a wasteful number, since it uses less digits than its factorization.

31103213031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560588472 (or 4560588470 counting only the distinct ones).

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

Adding to 31103213031220 its reverse (2213031230113), we get a palindrome (33316244261333).

The spelling of 31103213031220 in words is "thirty-one trillion, one hundred three billion, two hundred thirteen million, thirty-one thousand, two hundred twenty".