21479433 has 4 divisors (see below), whose sum is σ = 28639248. Its totient is φ = 14319620.

The previous prime is 21479429. The next prime is 21479441. The reversal of 21479433 is 33497412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21479433 - 2² = 21479429 is a prime.

It is a super-2 number, since 2×21479433² = 922732084002978, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21479394 and 21479403.

It is not an unprimeable number, because it can be changed into a prime (21479333) 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, 3579903 + ... + 3579908.

It is an arithmetic number, because the mean of its divisors is an integer number (7159812).

Almost surely, 2^21479433 is an apocalyptic number.

It is an amenable number.

21479433 is a deficient number, since it is larger than the sum of its proper divisors (7159815).

21479433 is an equidigital number, since it uses as much as digits as its factorization.

21479433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7159814.

The product of its digits is 18144, while the sum is 33.

The square root of 21479433 is about 4634.5909204589. The cubic root of 21479433 is about 277.9761939831.

It can be divided in two parts, 21479 and 433, that added together give a palindrome (21912).

The spelling of 21479433 in words is "twenty-one million, four hundred seventy-nine thousand, four hundred thirty-three".