11111221111020 has 96 divisors (see below), whose sum is σ = 32171538486528. Its totient is φ = 2863697371392.

The previous prime is 11111221110917. The next prime is 11111221111031. The reversal of 11111221111020 is 2011112211111.

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

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, 25862274 + ... + 26288393.

It is an arithmetic number, because the mean of its divisors is an integer number (335120192568).

Almost surely, 2^{11111221111020} is an apocalyptic number.

11111221111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111221111020 is an abundant number, since it is smaller than the sum of its proper divisors (21060317375508).

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

11111221111020 is a wasteful number, since it uses less digits than its factorization.

11111221111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52150799 (or 52150797 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 11111221111020 its reverse (2011112211111), we get a palindrome (13122333322131).

The spelling of 11111221111020 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, twenty".