21427363 has 4 divisors (see below), whose sum is σ = 21685608. Its totient is φ = 21169120.

The previous prime is 21427349. The next prime is 21427369. The reversal of 21427363 is 36372412.

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 21427363 - 2⁵ = 21427331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21427369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128998 + ... + 129163.

It is an arithmetic number, because the mean of its divisors is an integer number (5421402).

Almost surely, 2^21427363 is an apocalyptic number.

21427363 is a deficient number, since it is larger than the sum of its proper divisors (258245).

21427363 is an equidigital number, since it uses as much as digits as its factorization.

21427363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258244.

The product of its digits is 6048, while the sum is 28.

The square root of 21427363 is about 4628.9699718188. The cubic root of 21427363 is about 277.7513908387.

Adding to 21427363 its reverse (36372412), we get a palindrome (57799775).

The spelling of 21427363 in words is "twenty-one million, four hundred twenty-seven thousand, three hundred sixty-three".