21330319 has 4 divisors (see below), whose sum is σ = 21526120. Its totient is φ = 21134520.

The previous prime is 21330313. The next prime is 21330347. The reversal of 21330319 is 91303312.

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 21330319 - 2³ = 21330311 is a prime.

It is a super-2 number, since 2×21330319² = 909965017283522, 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 21330319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330311) 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, 97737 + ... + 97954.

It is an arithmetic number, because the mean of its divisors is an integer number (5381530).

Almost surely, 2^21330319 is an apocalyptic number.

21330319 is a deficient number, since it is larger than the sum of its proper divisors (195801).

21330319 is a wasteful number, since it uses less digits than its factorization.

21330319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195800.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 21330319 is about 4618.4758308342. The cubic root of 21330319 is about 277.3314464875.

The spelling of 21330319 in words is "twenty-one million, three hundred thirty thousand, three hundred nineteen".