31001221020100 has 36 divisors (see below), whose sum is σ = 67288069458064. Its totient is φ = 12397646040480.

The previous prime is 31001221020067. The next prime is 31001221020137. The reversal of 31001221020100 is 102012210013.

It is a super-2 number, since 2×31001221020100² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35091114 + ... + 35963713.

Almost surely, 2^{31001221020100} is an apocalyptic number.

It is an amenable number.

31001221020100 is an abundant number, since it is smaller than the sum of its proper divisors (36286848437964).

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

31001221020100 is a wasteful number, since it uses less digits than its factorization.

31001221020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71059204 (or 71059197 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31001221020100 its reverse (102012210013), we get a palindrome (31103233230113).

The spelling of 31001221020100 in words is "thirty-one trillion, one billion, two hundred twenty-one million, twenty thousand, one hundred".