21522327 has 4 divisors (see below), whose sum is σ = 28696440. Its totient is φ = 14348216.

The previous prime is 21522313. The next prime is 21522329. The reversal of 21522327 is 72322512.

It is a happy number.

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 21522327 - 2¹⁶ = 21456791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21522297 and 21522306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3587052 + ... + 3587057.

It is an arithmetic number, because the mean of its divisors is an integer number (7174110).

Almost surely, 2^21522327 is an apocalyptic number.

21522327 is a deficient number, since it is larger than the sum of its proper divisors (7174113).

21522327 is an equidigital number, since it uses as much as digits as its factorization.

21522327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7174112.

The product of its digits is 1680, while the sum is 24.

The square root of 21522327 is about 4639.2162053519. The cubic root of 21522327 is about 278.1611085888.

Adding to 21522327 its reverse (72322512), we get a palindrome (93844839).

The spelling of 21522327 in words is "twenty-one million, five hundred twenty-two thousand, three hundred twenty-seven".