121501660 has 48 divisors (see below), whose sum is σ = 298400256. Its totient is φ = 40686912.

The previous prime is 121501657. The next prime is 121501693. The reversal of 121501660 is 66105121.

It is a congruent 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, 4072 + ... + 16111.

It is an arithmetic number, because the mean of its divisors is an integer number (6216672).

Almost surely, 2^121501660 is an apocalyptic number.

121501660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121501660 is an abundant number, since it is smaller than the sum of its proper divisors (176898596).

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

121501660 is a wasteful number, since it uses less digits than its factorization.

121501660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20242 (or 20240 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 121501660 is about 11022.7791413962. The cubic root of 121501660 is about 495.2913429615.

Adding to 121501660 its reverse (66105121), we get a palindrome (187606781).

The spelling of 121501660 in words is "one hundred twenty-one million, five hundred one thousand, six hundred sixty".