121225560 has 64 divisors (see below), whose sum is σ = 364435200. Its totient is φ = 32259456.

The previous prime is 121225547. The next prime is 121225603. The reversal of 121225560 is 65522121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121225560.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87997 + ... + 89363.

It is an arithmetic number, because the mean of its divisors is an integer number (5694300).

Almost surely, 2^121225560 is an apocalyptic number.

121225560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121225560 is an abundant number, since it is smaller than the sum of its proper divisors (243209640).

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

121225560 is a wasteful number, since it uses less digits than its factorization.

121225560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120 (or 2116 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 121225560 is about 11010.2479536112. The cubic root of 121225560 is about 494.9158922498.

Adding to 121225560 its reverse (65522121), we get a palindrome (186747681).

The spelling of 121225560 in words is "one hundred twenty-one million, two hundred twenty-five thousand, five hundred sixty".