21315047327 has 8 divisors (see below), whose sum is σ = 24425365536. Its totient is φ = 18221056992.

The previous prime is 21315047297. The next prime is 21315047353. The reversal of 21315047327 is 72374051312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21315047327 - 2³⁴ = 4135178143 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 (21315047387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4079168 + ... + 4084389.

It is an arithmetic number, because the mean of its divisors is an integer number (3053170692).

Almost surely, 2^21315047327 is an apocalyptic number.

21315047327 is a deficient number, since it is larger than the sum of its proper divisors (3110318209).

21315047327 is an equidigital number, since it uses as much as digits as its factorization.

21315047327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8163937.

The product of its (nonzero) digits is 35280, while the sum is 35.

Adding to 21315047327 its reverse (72374051312), we get a palindrome (93689098639).

The spelling of 21315047327 in words is "twenty-one billion, three hundred fifteen million, forty-seven thousand, three hundred twenty-seven".