21459433 has 4 divisors (see below), whose sum is σ = 21474180. Its totient is φ = 21444688.

The previous prime is 21459419. The next prime is 21459443. The reversal of 21459433 is 33495412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3583449 + 17875984 = 1893^2 + 4228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21459433 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21459395 and 21459404.

It is not an unprimeable number, because it can be changed into a prime (21459443) 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, 4918 + ... + 8191.

It is an arithmetic number, because the mean of its divisors is an integer number (5368545).

Almost surely, 2^21459433 is an apocalyptic number.

It is an amenable number.

21459433 is a deficient number, since it is larger than the sum of its proper divisors (14747).

21459433 is a wasteful number, since it uses less digits than its factorization.

21459433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14746.

The product of its digits is 12960, while the sum is 31.

The square root of 21459433 is about 4632.4327302185. The cubic root of 21459433 is about 277.8898904898.

The spelling of 21459433 in words is "twenty-one million, four hundred fifty-nine thousand, four hundred thirty-three".