120171221 has 4 divisors (see below), whose sum is σ = 124047744. Its totient is φ = 116294700.

The previous prime is 120171211. The next prime is 120171223. The reversal of 120171221 is 122171021.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120171221 is a prime.

It is a super-2 number, since 2×120171221² = 28882244713261682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120171221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120171223) 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, 1938215 + ... + 1938276.

It is an arithmetic number, because the mean of its divisors is an integer number (31011936).

Almost surely, 2^120171221 is an apocalyptic number.

It is an amenable number.

120171221 is a deficient number, since it is larger than the sum of its proper divisors (3876523).

120171221 is an equidigital number, since it uses as much as digits as its factorization.

120171221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876522.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 120171221 is about 10962.2634980190. The cubic root of 120171221 is about 493.4768963219.

The spelling of 120171221 in words is "one hundred twenty million, one hundred seventy-one thousand, two hundred twenty-one".