121255560 has 96 divisors (see below), whose sum is σ = 417282840. Its totient is φ = 30431232.

The previous prime is 121255559. The next prime is 121255591. The reversal of 121255560 is 65552121.

It can be written as a sum of positive squares in 4 ways, for example, as 72897444 + 48358116 = 8538^2 + 6954^2 .

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 23 ways as a sum of consecutive naturals, for example, 3787 + ... + 16026.

Almost surely, 2^121255560 is an apocalyptic number.

121255560 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 121255560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208641420).

121255560 is an abundant number, since it is smaller than the sum of its proper divisors (296027280).

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

121255560 is a wasteful number, since it uses less digits than its factorization.

121255560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19847 (or 19840 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 121255560 is about 11011.6102364731. The cubic root of 121255560 is about 494.9567149172.

The spelling of 121255560 in words is "one hundred twenty-one million, two hundred fifty-five thousand, five hundred sixty".