21448565 has 8 divisors (see below), whose sum is σ = 26174880. Its totient is φ = 16867792.

The previous prime is 21448561. The next prime is 21448571. The reversal of 21448565 is 56584412.

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 21448565 - 2² = 21448561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21448561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36059 + ... + 36648.

It is an arithmetic number, because the mean of its divisors is an integer number (3271860).

Almost surely, 2^21448565 is an apocalyptic number.

It is an amenable number.

21448565 is a deficient number, since it is larger than the sum of its proper divisors (4726315).

21448565 is an equidigital number, since it uses as much as digits as its factorization.

21448565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72771.

The product of its digits is 38400, while the sum is 35.

The square root of 21448565 is about 4631.2595478984. The cubic root of 21448565 is about 277.8429706836.

The spelling of 21448565 in words is "twenty-one million, four hundred forty-eight thousand, five hundred sixty-five".