111121121020 has 72 divisors (see below), whose sum is σ = 292334059584. Its totient is φ = 35167999104.

The previous prime is 111121121009. The next prime is 111121121063. The reversal of 111121121020 is 20121121111.

It is a happy number.

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

It is a congruent number.

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, 4348372 + ... + 4373851.

It is an arithmetic number, because the mean of its divisors is an integer number (4060195272).

Almost surely, 2^111121121020 is an apocalyptic number.

111121121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121121020 is an abundant number, since it is smaller than the sum of its proper divisors (181212938564).

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

111121121020 is a wasteful number, since it uses less digits than its factorization.

111121121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8722259 (or 8722250 counting only the distinct ones).

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

Adding to 111121121020 its reverse (20121121111), we get a palindrome (131242242131).

Subtracting from 111121121020 its reverse (20121121111), we obtain a palindrome (90999999909).

The spelling of 111121121020 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty".