21417323 has 2 divisors, whose sum is σ = 21417324. Its totient is φ = 21417322.

The previous prime is 21417317. The next prime is 21417329. The reversal of 21417323 is 32371412.

It is a balanced prime because it is at equal distance from previous prime (21417317) and next prime (21417329).

It is a cyclic number.

It is not a de Polignac number, because 21417323 - 2⁴ = 21417307 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21417329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708661 + 10708662.

It is an arithmetic number, because the mean of its divisors is an integer number (10708662).

Almost surely, 2^21417323 is an apocalyptic number.

21417323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21417323 is an equidigital number, since it uses as much as digits as its factorization.

21417323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 23.

The square root of 21417323 is about 4627.8853702312. The cubic root of 21417323 is about 277.7080030200.

Adding to 21417323 its reverse (32371412), we get a palindrome (53788735).

The spelling of 21417323 in words is "twenty-one million, four hundred seventeen thousand, three hundred twenty-three".