111101211220 has 12 divisors (see below), whose sum is σ = 233312543604. Its totient is φ = 44440484480.

The previous prime is 111101211181. The next prime is 111101211223. The reversal of 111101211220 is 22112101111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33960592656 + 77140618564 = 184284^2 + 277742^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 111101211220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101211223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777530261 + ... + 2777530300.

It is an arithmetic number, because the mean of its divisors is an integer number (19442711967).

Almost surely, 2^111101211220 is an apocalyptic number.

111101211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111101211220 is an abundant number, since it is smaller than the sum of its proper divisors (122211332384).

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

111101211220 is a wasteful number, since it uses less digits than its factorization.

111101211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555060570 (or 5555060568 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111101211220 its reverse (22112101111), we get a palindrome (133213312331).

The spelling of 111101211220 in words is "one hundred eleven billion, one hundred one million, two hundred eleven thousand, two hundred twenty".