121552220 has 12 divisors (see below), whose sum is σ = 255259704. Its totient is φ = 48620880.

The previous prime is 121552183. The next prime is 121552241. The reversal of 121552220 is 22255121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6077611 = 121552220 / (1 + 2 + 1 + 5 + 5 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 121552192 and 121552201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3038786 + ... + 3038825.

It is an arithmetic number, because the mean of its divisors is an integer number (21271642).

Almost surely, 2^121552220 is an apocalyptic number.

121552220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121552220 is an abundant number, since it is smaller than the sum of its proper divisors (133707484).

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

121552220 is a wasteful number, since it uses less digits than its factorization.

121552220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6077620 (or 6077618 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 121552220 is about 11025.0723353636. The cubic root of 121552220 is about 495.3600346363.

It can be divided in two parts, 1215 and 52220, that added together give a palindrome (53435).

The spelling of 121552220 in words is "one hundred twenty-one million, five hundred fifty-two thousand, two hundred twenty".