120782921 has 8 divisors (see below), whose sum is σ = 138201024. Its totient is φ = 103405680.

The previous prime is 120782897. The next prime is 120782923. The reversal of 120782921 is 129287021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-120782921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (120782923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3590 + ... + 15951.

It is an arithmetic number, because the mean of its divisors is an integer number (17275128).

Almost surely, 2^120782921 is an apocalyptic number.

It is an amenable number.

120782921 is a deficient number, since it is larger than the sum of its proper divisors (17418103).

120782921 is an equidigital number, since it uses as much as digits as its factorization.

120782921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20431.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 120782921 is about 10990.1283431996. The cubic root of 120782921 is about 494.3127844242.

The spelling of 120782921 in words is "one hundred twenty million, seven hundred eighty-two thousand, nine hundred twenty-one".