121684140 has 48 divisors (see below), whose sum is σ = 378574560. Its totient is φ = 32448960.

The previous prime is 121684139. The next prime is 121684141. The reversal of 121684140 is 41486121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121684139) and next prime (121684141).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121684141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112131 + ... + 113210.

It is an arithmetic number, because the mean of its divisors is an integer number (7886970).

Almost surely, 2^121684140 is an apocalyptic number.

121684140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121684140 is an abundant number, since it is smaller than the sum of its proper divisors (256890420).

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

121684140 is a wasteful number, since it uses less digits than its factorization.

121684140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225359 (or 225351 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 121684140 is about 11031.0534401751. The cubic root of 121684140 is about 495.5391737461.

The spelling of 121684140 in words is "one hundred twenty-one million, six hundred eighty-four thousand, one hundred forty".