120642221 has 4 divisors (see below), whose sum is σ = 137876832. Its totient is φ = 103407612.

The previous prime is 120642167. The next prime is 120642227. The reversal of 120642221 is 122246021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122246021 = 509 ⋅240169.

It is a de Polignac number, because none of the positive numbers 2^k-120642221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120642193 and 120642202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120642227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8617295 + ... + 8617308.

It is an arithmetic number, because the mean of its divisors is an integer number (34469208).

Almost surely, 2^120642221 is an apocalyptic number.

It is an amenable number.

120642221 is a deficient number, since it is larger than the sum of its proper divisors (17234611).

120642221 is an equidigital number, since it uses as much as digits as its factorization.

120642221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17234610.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 120642221 is about 10983.7252787932. The cubic root of 120642221 is about 494.1207682245.

Adding to 120642221 its reverse (122246021), we get a palindrome (242888242).

The spelling of 120642221 in words is "one hundred twenty million, six hundred forty-two thousand, two hundred twenty-one".