21323319 has 8 divisors (see below), whose sum is σ = 29348352. Its totient is φ = 13756920.

The previous prime is 21323311. The next prime is 21323371. The reversal of 21323319 is 91332312.

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

It is not a de Polignac number, because 21323319 - 2³ = 21323311 is a prime.

It is a super-2 number, since 2×21323319² = 909367866351522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323311) 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, 114549 + ... + 114734.

It is an arithmetic number, because the mean of its divisors is an integer number (3668544).

Almost surely, 2^21323319 is an apocalyptic number.

21323319 is a deficient number, since it is larger than the sum of its proper divisors (8025033).

21323319 is a wasteful number, since it uses less digits than its factorization.

21323319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229317.

The product of its digits is 972, while the sum is 24.

The square root of 21323319 is about 4617.7179428804. The cubic root of 21323319 is about 277.3011057547.

It can be divided in two parts, 213 and 23319, that added together give a palindrome (23532).

The spelling of 21323319 in words is "twenty-one million, three hundred twenty-three thousand, three hundred nineteen".