100120221220 has 48 divisors (see below), whose sum is σ = 214064625600. Its totient is φ = 39325739904.

The previous prime is 100120221199. The next prime is 100120221263. The reversal of 100120221220 is 22122021001.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 100120221220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306931 + ... + 542629.

It is an arithmetic number, because the mean of its divisors is an integer number (4459679700).

Almost surely, 2^100120221220 is an apocalyptic number.

100120221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100120221220 is an abundant number, since it is smaller than the sum of its proper divisors (113944404380).

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

100120221220 is a wasteful number, since it uses less digits than its factorization.

100120221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236092 (or 236090 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 100120221220 its reverse (22122021001), we get a palindrome (122242242221).

The spelling of 100120221220 in words is "one hundred billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty".