21327223 has 2 divisors, whose sum is σ = 21327224. Its totient is φ = 21327222.

The previous prime is 21327221. The next prime is 21327227. The reversal of 21327223 is 32272312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21327223 - 2¹ = 21327221 is a prime.

Together with 21327221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21327194 and 21327203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21327221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663611 + 10663612.

It is an arithmetic number, because the mean of its divisors is an integer number (10663612).

Almost surely, 2^21327223 is an apocalyptic number.

21327223 is the 2469-th centered heptagonal number.

21327223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21327223 is an equidigital number, since it uses as much as digits as its factorization.

21327223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 22.

The square root of 21327223 is about 4618.1406431593. The cubic root of 21327223 is about 277.3180280336.

Adding to 21327223 its reverse (32272312), we get a palindrome (53599535).

The spelling of 21327223 in words is "twenty-one million, three hundred twenty-seven thousand, two hundred twenty-three".