2021012989 has 8 divisors (see below), whose sum is σ = 2142187128. Its totient is φ = 1900093440.

The previous prime is 2021012971. The next prime is 2021012999. The reversal of 2021012989 is 9892101202.

It can be written as a sum of positive squares in 4 ways, for example, as 1111688964 + 909324025 = 33342^2 + 30155^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2021012989 - 2¹¹ = 2021010941 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 (2021012909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47172 + ... + 79165.

It is an arithmetic number, because the mean of its divisors is an integer number (267773391).

Almost surely, 2^2021012989 is an apocalyptic number.

It is an amenable number.

2021012989 is a deficient number, since it is larger than the sum of its proper divisors (121174139).

2021012989 is a wasteful number, since it uses less digits than its factorization.

2021012989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127295.

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

The square root of 2021012989 is about 44955.6780507201. The cubic root of 2021012989 is about 1264.3181375293.

The spelling of 2021012989 in words is "two billion, twenty-one million, twelve thousand, nine hundred eighty-nine".