21468679 has 4 divisors (see below), whose sum is σ = 21500440. Its totient is φ = 21436920.

The previous prime is 21468677. The next prime is 21468691. The reversal of 21468679 is 97686412.

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 21468679 - 2¹ = 21468677 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 (21468677) 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, 14844 + ... + 16225.

It is an arithmetic number, because the mean of its divisors is an integer number (5375110).

Almost surely, 2^21468679 is an apocalyptic number.

21468679 is a deficient number, since it is larger than the sum of its proper divisors (31761).

21468679 is an equidigital number, since it uses as much as digits as its factorization.

21468679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31760.

The product of its digits is 145152, while the sum is 43.

The square root of 21468679 is about 4633.4305865093. The cubic root of 21468679 is about 277.9297952565.

The spelling of 21468679 in words is "twenty-one million, four hundred sixty-eight thousand, six hundred seventy-nine".