120221209 has 8 divisors (see below), whose sum is σ = 121686408. Its totient is φ = 118761600.

The previous prime is 120221203. The next prime is 120221221. The reversal of 120221209 is 902122021.

It can be written as a sum of positive squares in 4 ways, for example, as 2975625 + 117245584 = 1725^2 + 10828^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 120221209 - 2³ = 120221201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120221201) 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, 55189 + ... + 57325.

It is an arithmetic number, because the mean of its divisors is an integer number (15210801).

Almost surely, 2^120221209 is an apocalyptic number.

It is an amenable number.

120221209 is a deficient number, since it is larger than the sum of its proper divisors (1465199).

120221209 is a wasteful number, since it uses less digits than its factorization.

120221209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 120221209 is about 10964.5432645414. The cubic root of 120221209 is about 493.5453112144.

It can be divided in two parts, 12022 and 1209, that added together give a palindrome (13231).

The spelling of 120221209 in words is "one hundred twenty million, two hundred twenty-one thousand, two hundred nine".