21463679 has 4 divisors (see below), whose sum is σ = 21757776. Its totient is φ = 21169584.

The previous prime is 21463667. The next prime is 21463697. The reversal of 21463679 is 97636412.

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

It is a cyclic number.

It is not a de Polignac number, because 21463679 - 2⁸ = 21463423 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 (21463609) 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, 146939 + ... + 147084.

It is an arithmetic number, because the mean of its divisors is an integer number (5439444).

Almost surely, 2^21463679 is an apocalyptic number.

21463679 is a deficient number, since it is larger than the sum of its proper divisors (294097).

21463679 is an equidigital number, since it uses as much as digits as its factorization.

21463679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294096.

The product of its digits is 54432, while the sum is 38.

The square root of 21463679 is about 4632.8909980702. The cubic root of 21463679 is about 277.9082172036.

The spelling of 21463679 in words is "twenty-one million, four hundred sixty-three thousand, six hundred seventy-nine".