21852802093 has 4 divisors (see below), whose sum is σ = 22385797308. Its totient is φ = 21319806880.

The previous prime is 21852802051. The next prime is 21852802109. The reversal of 21852802093 is 39020825812.

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 2492305929 + 19360496164 = 49923^2 + 139142^2 .

It is a cyclic number.

It is not a de Polignac number, because 21852802093 - 2²⁵ = 21819247661 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 (21852802003) 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, 266497546 + ... + 266497627.

It is an arithmetic number, because the mean of its divisors is an integer number (5596449327).

Almost surely, 2^21852802093 is an apocalyptic number.

It is an amenable number.

21852802093 is a deficient number, since it is larger than the sum of its proper divisors (532995215).

21852802093 is an equidigital number, since it uses as much as digits as its factorization.

21852802093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532995214.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 21852802093 in words is "twenty-one billion, eight hundred fifty-two million, eight hundred two thousand, ninety-three".