2021242989 has 4 divisors (see below), whose sum is σ = 2694990656. Its totient is φ = 1347495324.

The previous prime is 2021242987. The next prime is 2021243017. The reversal of 2021242989 is 9892421202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2021242989 - 2¹ = 2021242987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021242987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336873829 + ... + 336873834.

It is an arithmetic number, because the mean of its divisors is an integer number (673747664).

Almost surely, 2^2021242989 is an apocalyptic number.

It is an amenable number.

2021242989 is a deficient number, since it is larger than the sum of its proper divisors (673747667).

2021242989 is an equidigital number, since it uses as much as digits as its factorization.

2021242989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673747666.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 2021242989 is about 44958.2360530304. The cubic root of 2021242989 is about 1264.3660973301.

The spelling of 2021242989 in words is "two billion, twenty-one million, two hundred forty-two thousand, nine hundred eighty-nine".