21504230335325 has 6 divisors (see below), whose sum is σ = 26665245615834. Its totient is φ = 17203384268240.

The previous prime is 21504230335261. The next prime is 21504230335331. The reversal of 21504230335325 is 52353303240512.

It can be written as a sum of positive squares in 3 ways, for example, as 3335861156356 + 18168369178969 = 1826434^2 + 4262437^2 .

It is not a de Polignac number, because 21504230335325 - 2⁶ = 21504230335261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430084606682 + ... + 430084606731.

It is an arithmetic number, because the mean of its divisors is an integer number (4444207602639).

Almost surely, 2^{21504230335325} is an apocalyptic number.

21504230335325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21504230335325 is a deficient number, since it is larger than the sum of its proper divisors (5161015280509).

21504230335325 is an equidigital number, since it uses as much as digits as its factorization.

21504230335325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860169213423 (or 860169213418 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 38.

Adding to 21504230335325 its reverse (52353303240512), we get a palindrome (73857533575837).

The spelling of 21504230335325 in words is "twenty-one trillion, five hundred four billion, two hundred thirty million, three hundred thirty-five thousand, three hundred twenty-five".