121509684 has 72 divisors (see below), whose sum is σ = 314653248. Its totient is φ = 39527040.

The previous prime is 121509673. The next prime is 121509709. The reversal of 121509684 is 486905121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 349999 + ... + 350345.

It is an arithmetic number, because the mean of its divisors is an integer number (4370184).

Almost surely, 2^121509684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121509684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157326624).

121509684 is an abundant number, since it is smaller than the sum of its proper divisors (193143564).

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

121509684 is a wasteful number, since it uses less digits than its factorization.

121509684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 121509684 is about 11023.1431089322. The cubic root of 121509684 is about 495.3022457762.

The spelling of 121509684 in words is "one hundred twenty-one million, five hundred nine thousand, six hundred eighty-four".