2021730909 has 8 divisors (see below), whose sum is σ = 2940699552. Its totient is φ = 1225291440.

The previous prime is 2021730901. The next prime is 2021730917. The reversal of 2021730909 is 9090371202.

It is an interprime number because it is at equal distance from previous prime (2021730901) and next prime (2021730917).

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

It is not a de Polignac number, because 2021730909 - 2³ = 2021730901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 61264573 = 2021730909 / (2 + 0 + 2 + 1 + 7 + 3 + 0 + 9 + 0 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 2021730909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021730901) 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, 30632254 + ... + 30632319.

It is an arithmetic number, because the mean of its divisors is an integer number (367587444).

Almost surely, 2^2021730909 is an apocalyptic number.

It is an amenable number.

2021730909 is a deficient number, since it is larger than the sum of its proper divisors (918968643).

2021730909 is a wasteful number, since it uses less digits than its factorization.

2021730909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61264587.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 2021730909 is about 44963.6620950741. The cubic root of 2021730909 is about 1264.4678267900.

The spelling of 2021730909 in words is "two billion, twenty-one million, seven hundred thirty thousand, nine hundred nine".