21455714 has 8 divisors (see below), whose sum is σ = 36781248. Its totient is φ = 9195300.

The previous prime is 21455701. The next prime is 21455719. The reversal of 21455714 is 41755412.

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

It is not an unprimeable number, because it can be changed into a prime (21455719) 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, 766262 + ... + 766289.

It is an arithmetic number, because the mean of its divisors is an integer number (4597656).

Almost surely, 2^21455714 is an apocalyptic number.

21455714 is a deficient number, since it is larger than the sum of its proper divisors (15325534).

21455714 is a wasteful number, since it uses less digits than its factorization.

21455714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532560.

The product of its digits is 5600, while the sum is 29.

The square root of 21455714 is about 4632.0313038666. The cubic root of 21455714 is about 277.8738364432.

The spelling of 21455714 in words is "twenty-one million, four hundred fifty-five thousand, seven hundred fourteen".