21414863 has 8 divisors (see below), whose sum is σ = 22392288. Its totient is φ = 20441344.

The previous prime is 21414857. The next prime is 21414871. The reversal of 21414863 is 36841412.

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 21414863 - 2²² = 17220559 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 (21414803) 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, 21431 + ... + 22407.

It is an arithmetic number, because the mean of its divisors is an integer number (2799036).

Almost surely, 2^21414863 is an apocalyptic number.

21414863 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21414863 is a deficient number, since it is larger than the sum of its proper divisors (977425).

21414863 is an equidigital number, since it uses as much as digits as its factorization.

21414863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953.

The product of its digits is 4608, while the sum is 29.

The square root of 21414863 is about 4627.6195824635. The cubic root of 21414863 is about 277.6973700720.

The spelling of 21414863 in words is "twenty-one million, four hundred fourteen thousand, eight hundred sixty-three".