21853828873 has 4 divisors (see below), whose sum is σ = 21931600788. Its totient is φ = 21776056960.

The previous prime is 21853828849. The next prime is 21853828877. The reversal of 21853828873 is 37882835812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9808327369 + 12045501504 = 99037^2 + 109752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21853828873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21853828877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38885536 + ... + 38886097.

It is an arithmetic number, because the mean of its divisors is an integer number (5482900197).

Almost surely, 2^21853828873 is an apocalyptic number.

It is an amenable number.

21853828873 is a deficient number, since it is larger than the sum of its proper divisors (77771915).

21853828873 is an equidigital number, since it uses as much as digits as its factorization.

21853828873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77771914.

The product of its digits is 5160960, while the sum is 55.

The spelling of 21853828873 in words is "twenty-one billion, eight hundred fifty-three million, eight hundred twenty-eight thousand, eight hundred seventy-three".