120151221 has 8 divisors (see below), whose sum is σ = 160254240. Its totient is φ = 80074512.

The previous prime is 120151169. The next prime is 120151237. The reversal of 120151221 is 122151021.

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

It is not a de Polignac number, because 120151221 - 2⁷ = 120151093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120151221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120151921) 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, 10186 + ... + 18548.

It is an arithmetic number, because the mean of its divisors is an integer number (20031780).

Almost surely, 2^120151221 is an apocalyptic number.

It is an amenable number.

120151221 is a deficient number, since it is larger than the sum of its proper divisors (40103019).

120151221 is an equidigital number, since it uses as much as digits as its factorization.

120151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13155.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 120151221 is about 10961.3512396967. The cubic root of 120151221 is about 493.4495184816.

The spelling of 120151221 in words is "one hundred twenty million, one hundred fifty-one thousand, two hundred twenty-one".