21845609299 has 16 divisors (see below), whose sum is σ = 22642774560. Its totient is φ = 21061693440.

The previous prime is 21845609293. The next prime is 21845609329. The reversal of 21845609299 is 99290654812.

It is not a de Polignac number, because 21845609299 - 2⁵ = 21845609267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21845609293) 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, 2935287 + ... + 2942719.

It is an arithmetic number, because the mean of its divisors is an integer number (1415173410).

Almost surely, 2^21845609299 is an apocalyptic number.

21845609299 is a deficient number, since it is larger than the sum of its proper divisors (797165261).

21845609299 is an equidigital number, since it uses as much as digits as its factorization.

21845609299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8310.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 21845609299 in words is "twenty-one billion, eight hundred forty-five million, six hundred nine thousand, two hundred ninety-nine".