21336460547 has 4 divisors (see below), whose sum is σ = 21341188656. Its totient is φ = 21331732440.

The previous prime is 21336460517. The next prime is 21336460583. The reversal of 21336460547 is 74506463312.

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-21336460547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21336460507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2357279 + ... + 2366312.

It is an arithmetic number, because the mean of its divisors is an integer number (5335297164).

Almost surely, 2^21336460547 is an apocalyptic number.

21336460547 is a deficient number, since it is larger than the sum of its proper divisors (4728109).

21336460547 is an equidigital number, since it uses as much as digits as its factorization.

21336460547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4728108.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 21336460547 in words is "twenty-one billion, three hundred thirty-six million, four hundred sixty thousand, five hundred forty-seven".