121111220 has 24 divisors (see below), whose sum is σ = 260250144. Its totient is φ = 47317536.

The previous prime is 121111189. The next prime is 121111231. The reversal of 121111220 is 22111121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69554 + ... + 71273.

It is an arithmetic number, because the mean of its divisors is an integer number (10843756).

Almost surely, 2^121111220 is an apocalyptic number.

121111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111220 is an abundant number, since it is smaller than the sum of its proper divisors (139138924).

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

121111220 is a wasteful number, since it uses less digits than its factorization.

121111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140879 (or 140877 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 121111220 is about 11005.0542933690. The cubic root of 121111220 is about 494.7602416760.

Adding to 121111220 its reverse (22111121), we get a palindrome (143222341).

Subtracting from 121111220 its reverse (22111121), we obtain a palindrome (99000099).

It can be divided in two parts, 12111 and 1220, that added together give a palindrome (13331).

The spelling of 121111220 in words is "one hundred twenty-one million, one hundred eleven thousand, two hundred twenty".