111102021220 has 48 divisors (see below), whose sum is σ = 241405925040. Its totient is φ = 42900125184.

The previous prime is 111102021179. The next prime is 111102021223. The reversal of 111102021220 is 22120201111.

It can be written as a sum of positive squares in 8 ways, for example, as 1445672484 + 109656348736 = 38022^2 + 331144^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 111102021220.

It is not an unprimeable number, because it can be changed into a prime (111102021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3625402 + ... + 3655918.

It is an arithmetic number, because the mean of its divisors is an integer number (5029290105).

Almost surely, 2^111102021220 is an apocalyptic number.

111102021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111102021220 is an abundant number, since it is smaller than the sum of its proper divisors (130303903820).

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

111102021220 is a wasteful number, since it uses less digits than its factorization.

111102021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36832 (or 36830 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111102021220 its reverse (22120201111), we get a palindrome (133222222331).

The spelling of 111102021220 in words is "one hundred eleven billion, one hundred two million, twenty-one thousand, two hundred twenty".