120912221 has 2 divisors, whose sum is σ = 120912222. Its totient is φ = 120912220.

The previous prime is 120912217. The next prime is 120912269. The reversal of 120912221 is 122219021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102292996 + 18619225 = 10114^2 + 4315^2 .

It is a cyclic number.

It is not a de Polignac number, because 120912221 - 2² = 120912217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 120912193 and 120912202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120912271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60456110 + 60456111.

It is an arithmetic number, because the mean of its divisors is an integer number (60456111).

Almost surely, 2^120912221 is an apocalyptic number.

It is an amenable number.

120912221 is a deficient number, since it is larger than the sum of its proper divisors (1).

120912221 is an equidigital number, since it uses as much as digits as its factorization.

120912221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 120912221 is about 10996.0093215675. The cubic root of 120912221 is about 494.4891113664.

The spelling of 120912221 in words is "one hundred twenty million, nine hundred twelve thousand, two hundred twenty-one".