11111220101220 has 96 divisors (see below), whose sum is σ = 32590406999808. Its totient is φ = 2823138312192.

The previous prime is 11111220101209. The next prime is 11111220101237. The reversal of 11111220101220 is 2210102211111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11111220101220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15309949 + ... + 16019268.

It is an arithmetic number, because the mean of its divisors is an integer number (339483406248).

Almost surely, 2^{11111220101220} is an apocalyptic number.

11111220101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111220101220 is an abundant number, since it is smaller than the sum of its proper divisors (21479186898588).

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

11111220101220 is a wasteful number, since it uses less digits than its factorization.

11111220101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31329509 (or 31329507 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11111220101220 its reverse (2210102211111), we get a palindrome (13321322312331).

The spelling of 11111220101220 in words is "eleven trillion, one hundred eleven billion, two hundred twenty million, one hundred one thousand, two hundred twenty".