21333379 has 4 divisors (see below), whose sum is σ = 21422880. Its totient is φ = 21243880.

The previous prime is 21333353. The next prime is 21333413. The reversal of 21333379 is 97333312.

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

It is a cyclic number.

It is not a de Polignac number, because 21333379 - 2⁷ = 21333251 is a prime.

It is a super-2 number, since 2×21333379² = 910226119115282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21333379.

It is not an unprimeable number, because it can be changed into a prime (21333329) 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, 44392 + ... + 44869.

It is an arithmetic number, because the mean of its divisors is an integer number (5355720).

Almost surely, 2^21333379 is an apocalyptic number.

21333379 is a deficient number, since it is larger than the sum of its proper divisors (89501).

21333379 is an equidigital number, since it uses as much as digits as its factorization.

21333379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89500.

The product of its digits is 10206, while the sum is 31.

The square root of 21333379 is about 4618.8070970760. The cubic root of 21333379 is about 277.3447076370.

It can be divided in two parts, 21333 and 379, that added together give a palindrome (21712).

The spelling of 21333379 in words is "twenty-one million, three hundred thirty-three thousand, three hundred seventy-nine".