121302720 has 336 divisors, whose sum is σ = 521134848. Its totient is φ = 25159680.

The previous prime is 121302697. The next prime is 121302733. The reversal of 121302720 is 27203121.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121302693 and 121302702.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 221487 + ... + 222033.

Almost surely, 2^121302720 is an apocalyptic number.

121302720 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 121302720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260567424).

121302720 is an abundant number, since it is smaller than the sum of its proper divisors (399832128).

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

121302720 is a wasteful number, since it uses less digits than its factorization.

121302720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 121302720 is about 11013.7514044943. The cubic root of 121302720 is about 495.0208745406.

Adding to 121302720 its reverse (27203121), we get a palindrome (148505841).

The spelling of 121302720 in words is "one hundred twenty-one million, three hundred two thousand, seven hundred twenty".