120021289 has 2 divisors, whose sum is σ = 120021290. Its totient is φ = 120021288.

The previous prime is 120021277. The next prime is 120021323. The reversal of 120021289 is 982120021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66145689 + 53875600 = 8133^2 + 7340^2 .

It is a cyclic number.

It is not a de Polignac number, because 120021289 - 2⁵ = 120021257 is a prime.

It is not a weakly prime, because it can be changed into another prime (120621289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010644 + 60010645.

It is an arithmetic number, because the mean of its divisors is an integer number (60010645).

Almost surely, 2^120021289 is an apocalyptic number.

It is an amenable number.

120021289 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021289 is an equidigital number, since it uses as much as digits as its factorization.

120021289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 120021289 is about 10955.4228124705. The cubic root of 120021289 is about 493.2715815796.

The spelling of 120021289 in words is "one hundred twenty million, twenty-one thousand, two hundred eighty-nine".