21332347 has 2 divisors, whose sum is σ = 21332348. Its totient is φ = 21332346.

The previous prime is 21332329. The next prime is 21332351. The reversal of 21332347 is 74323312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21332347 - 2¹¹ = 21330299 is a prime.

It is not a weakly prime, because it can be changed into another prime (21332357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666173 + 10666174.

It is an arithmetic number, because the mean of its divisors is an integer number (10666174).

Almost surely, 2^21332347 is an apocalyptic number.

21332347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332347 is an equidigital number, since it uses as much as digits as its factorization.

21332347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 25.

The square root of 21332347 is about 4618.6953785674. The cubic root of 21332347 is about 277.3402353910.

Adding to 21332347 its reverse (74323312), we get a palindrome (95655659).

The spelling of 21332347 in words is "twenty-one million, three hundred thirty-two thousand, three hundred forty-seven".