21465508327 has 4 divisors (see below), whose sum is σ = 21465965880. Its totient is φ = 21465050776.

The previous prime is 21465508283. The next prime is 21465508459. The reversal of 21465508327 is 72380556412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21465508327 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 (21465508627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149173 + ... + 255310.

It is an arithmetic number, because the mean of its divisors is an integer number (5366491470).

Almost surely, 2^21465508327 is an apocalyptic number.

21465508327 is a deficient number, since it is larger than the sum of its proper divisors (457553).

21465508327 is an equidigital number, since it uses as much as digits as its factorization.

21465508327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457552.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 21465508327 in words is "twenty-one billion, four hundred sixty-five million, five hundred eight thousand, three hundred twenty-seven".