11111101220 has 72 divisors (see below), whose sum is σ = 24289574400. Its totient is φ = 4269101760.

The previous prime is 11111101217. The next prime is 11111101241. The reversal of 11111101220 is 2210111111.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2669501 + ... + 2673659.

It is an arithmetic number, because the mean of its divisors is an integer number (337355200).

Almost surely, 2^11111101220 is an apocalyptic number.

11111101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11111101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12144787200).

11111101220 is an abundant number, since it is smaller than the sum of its proper divisors (13178473180).

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

11111101220 is a wasteful number, since it uses less digits than its factorization.

11111101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4369 (or 4336 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111101220 its reverse (2210111111), we get a palindrome (13321212331).

The spelling of 11111101220 in words is "eleven billion, one hundred eleven million, one hundred one thousand, two hundred twenty".