111121001220 has 24 divisors (see below), whose sum is σ = 311138803584. Its totient is φ = 29632266976.

The previous prime is 111121001207. The next prime is 111121001249. The reversal of 111121001220 is 22100121111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 111121001196 and 111121001205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926008284 + ... + 926008403.

It is an arithmetic number, because the mean of its divisors is an integer number (12964116816).

Almost surely, 2^111121001220 is an apocalyptic number.

111121001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121001220 is an abundant number, since it is smaller than the sum of its proper divisors (200017802364).

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

111121001220 is a wasteful number, since it uses less digits than its factorization.

111121001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852016699 (or 1852016697 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111121001220 its reverse (22100121111), we get a palindrome (133221122331).

The spelling of 111121001220 in words is "one hundred eleven billion, one hundred twenty-one million, one thousand, two hundred twenty".