21853223325 has 72 divisors (see below), whose sum is σ = 42873316200. Its totient is φ = 10591150080.

The previous prime is 21853223317. The next prime is 21853223347. The reversal of 21853223325 is 52332235812.

21853223325 is a `hidden beast` number, since 2 + 1 + 8 + 5 + 322 + 3 + 325 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 1605925476 + 20247297849 = 40074^2 + 142293^2 .

It is not a de Polignac number, because 21853223325 - 2³ = 21853223317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21853223325.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12421 + ... + 209429.

It is an arithmetic number, because the mean of its divisors is an integer number (595462725).

Almost surely, 2^21853223325 is an apocalyptic number.

21853223325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21853223325 is a deficient number, since it is larger than the sum of its proper divisors (21020092875).

21853223325 is a wasteful number, since it uses less digits than its factorization.

21853223325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197071 (or 197063 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 21853223325 in words is "twenty-one billion, eight hundred fifty-three million, two hundred twenty-three thousand, three hundred twenty-five".