21325304015 has 16 divisors (see below), whose sum is σ = 25868862432. Its totient is φ = 16874778624.

The previous prime is 21325303991. The next prime is 21325304051. The reversal of 21325304015 is 51040352312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21325304015 - 2⁸ = 21325303759 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 913367 + ... + 936423.

It is an arithmetic number, because the mean of its divisors is an integer number (1616803902).

Almost surely, 2^21325304015 is an apocalyptic number.

21325304015 is a deficient number, since it is larger than the sum of its proper divisors (4543558417).

21325304015 is a wasteful number, since it uses less digits than its factorization.

21325304015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25066.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21325304015 its reverse (51040352312), we get a palindrome (72365656327).

The spelling of 21325304015 in words is "twenty-one billion, three hundred twenty-five million, three hundred four thousand, fifteen".