121187660 has 48 divisors (see below), whose sum is σ = 279568800. Its totient is φ = 43760640.

The previous prime is 121187609. The next prime is 121187683. The reversal of 121187660 is 66781121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30932 + ... + 34628.

It is an arithmetic number, because the mean of its divisors is an integer number (5824350).

Almost surely, 2^121187660 is an apocalyptic number.

121187660 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 121187660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139784400).

121187660 is an abundant number, since it is smaller than the sum of its proper divisors (158381140).

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

121187660 is a wasteful number, since it uses less digits than its factorization.

121187660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866 (or 3864 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 121187660 is about 11008.5266952486. The cubic root of 121187660 is about 494.8643099833.

It can be divided in two parts, 121 and 187660, that added together give a palindrome (187781).

The spelling of 121187660 in words is "one hundred twenty-one million, one hundred eighty-seven thousand, six hundred sixty".