121993656 has 64 divisors (see below), whose sum is σ = 323550720. Its totient is φ = 38248320.

The previous prime is 121993643. The next prime is 121993673. The reversal of 121993656 is 656399121.

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, 31861 + ... + 35483.

It is an arithmetic number, because the mean of its divisors is an integer number (5055480).

Almost surely, 2^121993656 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 121993656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161775360).

121993656 is an abundant number, since it is smaller than the sum of its proper divisors (201557064).

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

121993656 is a wasteful number, since it uses less digits than its factorization.

121993656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716 (or 3712 counting only the distinct ones).

The product of its digits is 87480, while the sum is 42.

The square root of 121993656 is about 11045.0738340674. The cubic root of 121993656 is about 495.9589694641.

It can be divided in two parts, 12199 and 3656, that multiplied together give a palindrome (44599544).

The spelling of 121993656 in words is "one hundred twenty-one million, nine hundred ninety-three thousand, six hundred fifty-six".