21301367 has 4 divisors (see below), whose sum is σ = 21315840. Its totient is φ = 21286896.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301367 is 76310312.

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 21301367 - 2² = 21301363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301361) 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 in 3 ways as a sum of consecutive naturals, for example, 4742 + ... + 8067.

It is an arithmetic number, because the mean of its divisors is an integer number (5328960).

Almost surely, 2^21301367 is an apocalyptic number.

21301367 is a deficient number, since it is larger than the sum of its proper divisors (14473).

21301367 is a wasteful number, since it uses less digits than its factorization.

21301367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14472.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21301367 is about 4615.3403991472. The cubic root of 21301367 is about 277.2059141322.

Adding to 21301367 its reverse (76310312), we get a palindrome (97611679).

The spelling of 21301367 in words is "twenty-one million, three hundred one thousand, three hundred sixty-seven".