2021110909 has 16 divisors (see below), whose sum is σ = 2169504000. Its totient is φ = 1876155904.

The previous prime is 2021110843. The next prime is 2021110913. The reversal of 2021110909 is 9090111202.

It is not a de Polignac number, because 2021110909 - 2⁹ = 2021110397 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 (2021110969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432417 + ... + 437065.

It is an arithmetic number, because the mean of its divisors is an integer number (135594000).

Almost surely, 2^2021110909 is an apocalyptic number.

It is an amenable number.

2021110909 is a deficient number, since it is larger than the sum of its proper divisors (148393091).

2021110909 is a wasteful number, since it uses less digits than its factorization.

2021110909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5012.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 2021110909 is about 44956.7671101915. The cubic root of 2021110909 is about 1264.3385563379.

It can be divided in two parts, 202 and 1110909, that added together give a palindrome (1111111).

The spelling of 2021110909 in words is "two billion, twenty-one million, one hundred ten thousand, nine hundred nine".