31100020012220 has 96 divisors (see below), whose sum is σ = 71197614472320. Its totient is φ = 11375071769600.

The previous prime is 31100020012177. The next prime is 31100020012333. The reversal of 31100020012220 is 2221002000113.

It is a happy number.

It is a super-2 number, since 2×31100020012220² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31100020012195 and 31100020012204.

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, 10193927 + ... + 12888606.

It is an arithmetic number, because the mean of its divisors is an integer number (741641817420).

Almost surely, 2^{31100020012220} is an apocalyptic number.

It is an amenable number.

31100020012220 is an abundant number, since it is smaller than the sum of its proper divisors (40097594460100).

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

31100020012220 is a wasteful number, since it uses less digits than its factorization.

31100020012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23082695 (or 23082693 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31100020012220 its reverse (2221002000113), we get a palindrome (33321022012333).

The spelling of 31100020012220 in words is "thirty-one trillion, one hundred billion, twenty million, twelve thousand, two hundred twenty".