21275459 has 8 divisors (see below), whose sum is σ = 22776000. Its totient is φ = 19813032.

The previous prime is 21275399. The next prime is 21275461. The reversal of 21275459 is 95457212.

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 21275459 - 2⁸ = 21275203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275489) 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, 8369 + ... + 10610.

It is an arithmetic number, because the mean of its divisors is an integer number (2847000).

Almost surely, 2^21275459 is an apocalyptic number.

21275459 is a deficient number, since it is larger than the sum of its proper divisors (1500541).

21275459 is a wasteful number, since it uses less digits than its factorization.

21275459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19057.

The product of its digits is 25200, while the sum is 35.

The square root of 21275459 is about 4612.5328183114. The cubic root of 21275459 is about 277.0934837193.

The spelling of 21275459 in words is "twenty-one million, two hundred seventy-five thousand, four hundred fifty-nine".