111100021220 has 48 divisors (see below), whose sum is σ = 235087429248. Its totient is φ = 44101666560.

The previous prime is 111100021217. The next prime is 111100021223. The reversal of 111100021220 is 22120001111.

It is an interprime number because it is at equal distance from previous prime (111100021217) and next prime (111100021223).

It is not an unprimeable number, because it can be changed into a prime (111100021223) 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, 15403415 + ... + 15410625.

It is an arithmetic number, because the mean of its divisors is an integer number (4897654776).

Almost surely, 2^111100021220 is an apocalyptic number.

111100021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111100021220 is an abundant number, since it is smaller than the sum of its proper divisors (123987408028).

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

111100021220 is a wasteful number, since it uses less digits than its factorization.

111100021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12980 (or 12978 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111100021220 its reverse (22120001111), we get a palindrome (133220022331).

The spelling of 111100021220 in words is "one hundred eleven billion, one hundred million, twenty-one thousand, two hundred twenty".