121400220 has 24 divisors (see below), whose sum is σ = 339920784. Its totient is φ = 32373376.

The previous prime is 121400207. The next prime is 121400231. The reversal of 121400220 is 22004121.

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 = 121400196 and 121400205.

It is a congruent number.

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, 1011609 + ... + 1011728.

It is an arithmetic number, because the mean of its divisors is an integer number (14163366).

Almost surely, 2^121400220 is an apocalyptic number.

121400220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121400220 is an abundant number, since it is smaller than the sum of its proper divisors (218520564).

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

121400220 is a wasteful number, since it uses less digits than its factorization.

121400220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023349 (or 2023347 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 121400220 is about 11018.1768001789. The cubic root of 121400220 is about 495.1534673623.

Adding to 121400220 its reverse (22004121), we get a palindrome (143404341).

The spelling of 121400220 in words is "one hundred twenty-one million, four hundred thousand, two hundred twenty".