21319327 has 4 divisors (see below), whose sum is σ = 21558960. Its totient is φ = 21079696.

The previous prime is 21319307. The next prime is 21319373. The reversal of 21319327 is 72391312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21319327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21319295 and 21319304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319307) 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, 119683 + ... + 119860.

It is an arithmetic number, because the mean of its divisors is an integer number (5389740).

Almost surely, 2^21319327 is an apocalyptic number.

21319327 is a deficient number, since it is larger than the sum of its proper divisors (239633).

21319327 is an equidigital number, since it uses as much as digits as its factorization.

21319327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239632.

The product of its digits is 2268, while the sum is 28.

The square root of 21319327 is about 4617.2856745062. The cubic root of 21319327 is about 277.2837998950.

The spelling of 21319327 in words is "twenty-one million, three hundred nineteen thousand, three hundred twenty-seven".