2021120989 has 2 divisors, whose sum is σ = 2021120990. Its totient is φ = 2021120988.

The previous prime is 2021120963. The next prime is 2021121017. The reversal of 2021120989 is 9890211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1684692025 + 336428964 = 41045^2 + 18342^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021120989 - 2⁹ = 2021120477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021100989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560494 + 1010560495.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560495).

Almost surely, 2^2021120989 is an apocalyptic number.

It is an amenable number.

2021120989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021120989 is an equidigital number, since it uses as much as digits as its factorization.

2021120989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 2021120989 is about 44956.8792177571. The cubic root of 2021120989 is about 1264.3406582367.

The spelling of 2021120989 in words is "two billion, twenty-one million, one hundred twenty thousand, nine hundred eighty-nine".