111002220121 has 24 divisors (see below), whose sum is σ = 121505863752. Its totient is φ = 100805913600.

The previous prime is 111002220113. The next prime is 111002220157. The reversal of 111002220121 is 121022200111.

It can be written as a sum of positive squares in 4 ways, for example, as 8194775625 + 102807444496 = 90525^2 + 320636^2 .

It is not a de Polignac number, because 111002220121 - 2³ = 111002220113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (111002220181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36500361 + ... + 36503401.

It is an arithmetic number, because the mean of its divisors is an integer number (5062744323).

Almost surely, 2^111002220121 is an apocalyptic number.

It is an amenable number.

111002220121 is a deficient number, since it is larger than the sum of its proper divisors (10503643631).

111002220121 is an equidigital number, since it uses as much as digits as its factorization.

111002220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753 (or 3682 counting only the distinct ones).

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

Adding to 111002220121 its reverse (121022200111), we get a palindrome (232024420232).

The spelling of 111002220121 in words is "one hundred eleven billion, two million, two hundred twenty thousand, one hundred twenty-one".