121655600 has 120 divisors (see below), whose sum is σ = 326770752. Its totient is φ = 43142400.

The previous prime is 121655549. The next prime is 121655627. The reversal of 121655600 is 6556121.

It is a super-2 number, since 2×121655600² = 29600170022720000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121655600.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188879 + ... + 189521.

Almost surely, 2^121655600 is an apocalyptic number.

121655600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121655600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163385376).

121655600 is an abundant number, since it is smaller than the sum of its proper divisors (205115152).

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

121655600 is a wasteful number, since it uses less digits than its factorization.

121655600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 121655600 is about 11029.7597435302. The cubic root of 121655600 is about 495.5004291903.

The spelling of 121655600 in words is "one hundred twenty-one million, six hundred fifty-five thousand, six hundred".