121640684 has 12 divisors (see below), whose sum is σ = 232223208. Its totient is φ = 55291200.

The previous prime is 121640677. The next prime is 121640741. The reversal of 121640684 is 486046121.

It is a self number, because there is not a number n which added to its sum of digits gives 121640684.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382237 + ... + 1382324.

It is an arithmetic number, because the mean of its divisors is an integer number (19351934).

Almost surely, 2^121640684 is an apocalyptic number.

It is an amenable number.

121640684 is a deficient number, since it is larger than the sum of its proper divisors (110582524).

121640684 is a wasteful number, since it uses less digits than its factorization.

121640684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764576 (or 2764574 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 121640684 is about 11029.0835521361. The cubic root of 121640684 is about 495.4801775222.

The spelling of 121640684 in words is "one hundred twenty-one million, six hundred forty thousand, six hundred eighty-four".