21414399 has 8 divisors (see below), whose sum is σ = 28847280. Its totient is φ = 14128896.

The previous prime is 21414391. The next prime is 21414401. The reversal of 21414399 is 99341412.

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

It is not a de Polignac number, because 21414399 - 2³ = 21414391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414391) 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, 36504 + ... + 37085.

It is an arithmetic number, because the mean of its divisors is an integer number (3605910).

Almost surely, 2^21414399 is an apocalyptic number.

21414399 is a deficient number, since it is larger than the sum of its proper divisors (7432881).

21414399 is an equidigital number, since it uses as much as digits as its factorization.

21414399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73689.

The product of its digits is 7776, while the sum is 33.

The square root of 21414399 is about 4627.5694484254. The cubic root of 21414399 is about 277.6953644165.

The spelling of 21414399 in words is "twenty-one million, four hundred fourteen thousand, three hundred ninety-nine".