21456115 has 8 divisors (see below), whose sum is σ = 26443440. Its totient is φ = 16700832.

The previous prime is 21456107. The next prime is 21456131. The reversal of 21456115 is 51165412.

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 21456115 - 2³ = 21456107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21456115.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57805 + ... + 58174.

It is an arithmetic number, because the mean of its divisors is an integer number (3305430).

Almost surely, 2^21456115 is an apocalyptic number.

21456115 is a deficient number, since it is larger than the sum of its proper divisors (4987325).

21456115 is a wasteful number, since it uses less digits than its factorization.

21456115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116021.

The product of its digits is 1200, while the sum is 25.

The square root of 21456115 is about 4632.0745892095. The cubic root of 21456115 is about 277.8755675549.

The spelling of 21456115 in words is "twenty-one million, four hundred fifty-six thousand, one hundred fifteen".