2021100989 has 2 divisors, whose sum is σ = 2021100990. Its totient is φ = 2021100988.

The previous prime is 2021100979. The next prime is 2021100997. The reversal of 2021100989 is 9890011202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2000325625 + 20775364 = 44725^2 + 4558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021100989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021100979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010550494 + 1010550495.

It is an arithmetic number, because the mean of its divisors is an integer number (1010550495).

Almost surely, 2^2021100989 is an apocalyptic number.

It is an amenable number.

2021100989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021100989 is an equidigital number, since it uses as much as digits as its factorization.

2021100989 is an evil number, because the sum of its binary digits is even.

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

The square root of 2021100989 is about 44956.6567818382. The cubic root of 2021100989 is about 1264.3364877958.

The spelling of 2021100989 in words is "two billion, twenty-one million, one hundred thousand, nine hundred eighty-nine".