121111201220 has 48 divisors (see below), whose sum is σ = 257713397760. Its totient is φ = 47801460096.

The previous prime is 121111201207. The next prime is 121111201229. The reversal of 121111201220 is 22102111121.

It is a junction number, because it is equal to n+sod(n) for n = 121111201195 and 121111201204.

It is not an unprimeable number, because it can be changed into a prime (121111201229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2604494 + ... + 2650586.

It is an arithmetic number, because the mean of its divisors is an integer number (5369029120).

Almost surely, 2^121111201220 is an apocalyptic number.

121111201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111201220 is an abundant number, since it is smaller than the sum of its proper divisors (136602196540).

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

121111201220 is a wasteful number, since it uses less digits than its factorization.

121111201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47844 (or 47842 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121111201220 its reverse (22102111121), we get a palindrome (143213312341).

Subtracting from 121111201220 its reverse (22102111121), we obtain a palindrome (99009090099).

The spelling of 121111201220 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twenty".