21333479 has 4 divisors (see below), whose sum is σ = 21367920. Its totient is φ = 21299040.

The previous prime is 21333467. The next prime is 21333491. The reversal of 21333479 is 97433312.

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

It is an interprime number because it is at equal distance from previous prime (21333467) and next prime (21333491).

It is a cyclic number.

It is not a de Polignac number, because 21333479 - 2²⁰ = 20284903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16274 + ... + 17535.

It is an arithmetic number, because the mean of its divisors is an integer number (5341980).

Almost surely, 2^21333479 is an apocalyptic number.

21333479 is a deficient number, since it is larger than the sum of its proper divisors (34441).

21333479 is an equidigital number, since it uses as much as digits as its factorization.

21333479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34440.

The product of its digits is 13608, while the sum is 32.

The square root of 21333479 is about 4618.8179223693. The cubic root of 21333479 is about 277.3451409865.

It can be divided in two parts, 21333 and 479, that added together give a palindrome (21812).

The spelling of 21333479 in words is "twenty-one million, three hundred thirty-three thousand, four hundred seventy-nine".