21079433 has 8 divisors (see below), whose sum is σ = 21859200. Its totient is φ = 20303248.

The previous prime is 21079393. The next prime is 21079459. The reversal of 21079433 is 33497012.

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

It is not a de Polignac number, because 21079433 - 2⁶ = 21079369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21079396 and 21079405.

It is not an unprimeable number, because it can be changed into a prime (21079483) 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, 18560 + ... + 19662.

It is an arithmetic number, because the mean of its divisors is an integer number (2732400).

Almost surely, 2^21079433 is an apocalyptic number.

It is an amenable number.

21079433 is a deficient number, since it is larger than the sum of its proper divisors (779767).

21079433 is a wasteful number, since it uses less digits than its factorization.

21079433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 21079433 is about 4591.2343656145. The cubic root of 21079433 is about 276.2398365118.

It can be divided in two parts, 21079 and 433, that added together give a palindrome (21512).

The spelling of 21079433 in words is "twenty-one million, seventy-nine thousand, four hundred thirty-three".