121660140 has 72 divisors (see below), whose sum is σ = 396274032. Its totient is φ = 27807360.

The previous prime is 121660129. The next prime is 121660163. The reversal of 121660140 is 41066121.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 17751 + ... + 23630.

It is an arithmetic number, because the mean of its divisors is an integer number (5503806).

Almost surely, 2^121660140 is an apocalyptic number.

121660140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121660140 is an abundant number, since it is smaller than the sum of its proper divisors (274613892).

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

121660140 is a wasteful number, since it uses less digits than its factorization.

121660140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41407 (or 41398 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 121660140 is about 11029.9655484503. The cubic root of 121660140 is about 495.5065928851.

The spelling of 121660140 in words is "one hundred twenty-one million, six hundred sixty thousand, one hundred forty".