120989021 has 2 divisors, whose sum is σ = 120989022. Its totient is φ = 120989020.

The previous prime is 120988997. The next prime is 120989023.

It is a happy number.

120989021 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101505625 + 19483396 = 10075^2 + 4414^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120989021 is a prime.

Together with 120989023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120989023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60494510 + 60494511.

It is an arithmetic number, because the mean of its divisors is an integer number (60494511).

Almost surely, 2^120989021 is an apocalyptic number.

It is an amenable number.

120989021 is a deficient number, since it is larger than the sum of its proper divisors (1).

120989021 is an equidigital number, since it uses as much as digits as its factorization.

120989021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 120989021 is about 10999.5009432247. The cubic root of 120989021 is about 494.5937843424.

The spelling of 120989021 in words is "one hundred twenty million, nine hundred eighty-nine thousand, twenty-one".