2021966309 has 8 divisors (see below), whose sum is σ = 2207929152. Its totient is φ = 1836361440.

The previous prime is 2021966293. The next prime is 2021966321. The reversal of 2021966309 is 9036691202.

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 2021966309 - 2⁴ = 2021966293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021966389) 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, 77609 + ... + 100334.

It is an arithmetic number, because the mean of its divisors is an integer number (275991144).

Almost surely, 2^2021966309 is an apocalyptic number.

It is an amenable number.

2021966309 is a deficient number, since it is larger than the sum of its proper divisors (185962843).

2021966309 is a wasteful number, since it uses less digits than its factorization.

2021966309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178987.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 2021966309 is about 44966.2796882286. The cubic root of 2021966309 is about 1264.5169009395.

The spelling of 2021966309 in words is "two billion, twenty-one million, nine hundred sixty-six thousand, three hundred nine".