111221022021220 has 48 divisors (see below), whose sum is σ = 234330942134016. Its totient is φ = 44342371728000.

The previous prime is 111221022021211. The next prime is 111221022021229. The reversal of 111221022021220 is 22120220122111.

It is an interprime number because it is at equal distance from previous prime (111221022021211) and next prime (111221022021229).

It is a super-3 number, since 3×111221022021220³ (a number of 43 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (111221022021229) 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, 92898010 + ... + 94087630.

It is an arithmetic number, because the mean of its divisors is an integer number (4881894627792).

Almost surely, 2^{111221022021220} is an apocalyptic number.

111221022021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221022021220 is an abundant number, since it is smaller than the sum of its proper divisors (123109920112796).

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

111221022021220 is a wasteful number, since it uses less digits than its factorization.

111221022021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204972 (or 1204970 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 111221022021220 its reverse (22120220122111), we get a palindrome (133341242143331).

The spelling of 111221022021220 in words is "one hundred eleven trillion, two hundred twenty-one billion, twenty-two million, twenty-one thousand, two hundred twenty".