21314567 has 2 divisors, whose sum is σ = 21314568. Its totient is φ = 21314566.

The previous prime is 21314551. The next prime is 21314569. The reversal of 21314567 is 76541312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21314567 - 2⁴ = 21314551 is a prime.

Together with 21314569, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21314569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657283 + 10657284.

It is an arithmetic number, because the mean of its divisors is an integer number (10657284).

Almost surely, 2^21314567 is an apocalyptic number.

21314567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314567 is an equidigital number, since it uses as much as digits as its factorization.

21314567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 21314567 is about 4616.7701913784. The cubic root of 21314567 is about 277.2631618275.

Adding to 21314567 its reverse (76541312), we get a palindrome (97855879).

The spelling of 21314567 in words is "twenty-one million, three hundred fourteen thousand, five hundred sixty-seven".