21814899 has 8 divisors (see below), whose sum is σ = 29134080. Its totient is φ = 14519496.

The previous prime is 21814843. The next prime is 21814901. The reversal of 21814899 is 99841812.

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

It is not a de Polignac number, because 21814899 - 2²³ = 13426291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21814899.

It is not an unprimeable number, because it can be changed into a prime (21814399) 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, 3679 + ... + 7560.

It is an arithmetic number, because the mean of its divisors is an integer number (3641760).

Almost surely, 2^21814899 is an apocalyptic number.

21814899 is a deficient number, since it is larger than the sum of its proper divisors (7319181).

21814899 is a wasteful number, since it uses less digits than its factorization.

21814899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11889.

The product of its digits is 41472, while the sum is 42.

The square root of 21814899 is about 4670.6422470577. The cubic root of 21814899 is about 279.4158698323.

The spelling of 21814899 in words is "twenty-one million, eight hundred fourteen thousand, eight hundred ninety-nine".