121111010220 has 48 divisors (see below), whose sum is σ = 340180632288. Its totient is φ = 32194383360.

The previous prime is 121111010197. The next prime is 121111010261. The reversal of 121111010220 is 22010111121.

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 = 121111010196 and 121111010205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3164761 + ... + 3202800.

It is an arithmetic number, because the mean of its divisors is an integer number (7087096506).

Almost surely, 2^121111010220 is an apocalyptic number.

121111010220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111010220 is an abundant number, since it is smaller than the sum of its proper divisors (219069622068).

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

121111010220 is a wasteful number, since it uses less digits than its factorization.

121111010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6367890 (or 6367888 counting only the distinct ones).

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

Adding to 121111010220 its reverse (22010111121), we get a palindrome (143121121341).

The spelling of 121111010220 in words is "one hundred twenty-one billion, one hundred eleven million, ten thousand, two hundred twenty".