21314325515 has 48 divisors (see below), whose sum is σ = 31080609792. Its totient is φ = 13964803776.

The previous prime is 21314325511. The next prime is 21314325517. The reversal of 21314325515 is 51552341312.

It is not a de Polignac number, because 21314325515 - 2² = 21314325511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21314325511) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 7701662 + ... + 7704428.

It is an arithmetic number, because the mean of its divisors is an integer number (647512704).

Almost surely, 2^21314325515 is an apocalyptic number.

21314325515 is a deficient number, since it is larger than the sum of its proper divisors (9766284277).

21314325515 is a wasteful number, since it uses less digits than its factorization.

21314325515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176 (or 4169 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

Adding to 21314325515 its reverse (51552341312), we get a palindrome (72866666827).

The spelling of 21314325515 in words is "twenty-one billion, three hundred fourteen million, three hundred twenty-five thousand, five hundred fifteen".