21426367 has 8 divisors (see below), whose sum is σ = 22273776. Its totient is φ = 20593152.

The previous prime is 21426359. The next prime is 21426371. The reversal of 21426367 is 76362412.

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 21426367 - 2³ = 21426359 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 (21426337) 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, 418 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (2784222).

Almost surely, 2^21426367 is an apocalyptic number.

21426367 is a deficient number, since it is larger than the sum of its proper divisors (847409).

21426367 is an equidigital number, since it uses as much as digits as its factorization.

21426367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7097.

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

The square root of 21426367 is about 4628.8623872394. The cubic root of 21426367 is about 277.7470872344.

Adding to 21426367 its reverse (76362412), we get a palindrome (97788779).

The spelling of 21426367 in words is "twenty-one million, four hundred twenty-six thousand, three hundred sixty-seven".