21264367 has 8 divisors (see below), whose sum is σ = 21707280. Its totient is φ = 20824320.

The previous prime is 21264361. The next prime is 21264371. The reversal of 21264367 is 76346212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21264367 - 2⁷ = 21264239 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20317 + ... + 21337.

It is an arithmetic number, because the mean of its divisors is an integer number (2713410).

Almost surely, 2^21264367 is an apocalyptic number.

21264367 is a deficient number, since it is larger than the sum of its proper divisors (442913).

21264367 is a wasteful number, since it uses less digits than its factorization.

21264367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433.

The product of its digits is 12096, while the sum is 31.

The square root of 21264367 is about 4611.3302852864. The cubic root of 21264367 is about 277.0453209479.

The spelling of 21264367 in words is "twenty-one million, two hundred sixty-four thousand, three hundred sixty-seven".