121111111100220 has 24 divisors (see below), whose sum is σ = 339111111080784. Its totient is φ = 32296296293376.

The previous prime is 121111111100201. The next prime is 121111111100227. The reversal of 121111111100220 is 22001111111121.

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 121111111100220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111111100227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009259259109 + ... + 1009259259228.

It is an arithmetic number, because the mean of its divisors is an integer number (14129629628366).

Almost surely, 2^{121111111100220} is an apocalyptic number.

121111111100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111111100220 is an abundant number, since it is smaller than the sum of its proper divisors (217999999980564).

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

121111111100220 is a wasteful number, since it uses less digits than its factorization.

121111111100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018518518349 (or 2018518518347 counting only the distinct ones).

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

Adding to 121111111100220 its reverse (22001111111121), we get a palindrome (143112222211341).

The spelling of 121111111100220 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, one hundred thousand, two hundred twenty".