121659720 has 192 divisors, whose sum is σ = 452200320. Its totient is φ = 25638912.

The previous prime is 121659709. The next prime is 121659721. The reversal of 121659720 is 27956121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121659721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141532 + ... + 142388.

It is an arithmetic number, because the mean of its divisors is an integer number (2355210).

Almost surely, 2^121659720 is an apocalyptic number.

121659720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121659720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226100160).

121659720 is an abundant number, since it is smaller than the sum of its proper divisors (330540600).

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

121659720 is a wasteful number, since it uses less digits than its factorization.

121659720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 121659720 is about 11029.9465093898. The cubic root of 121659720 is about 495.5060226819.

The spelling of 121659720 in words is "one hundred twenty-one million, six hundred fifty-nine thousand, seven hundred twenty".