21814859 has 8 divisors (see below), whose sum is σ = 25198128. Its totient is φ = 18664960.

The previous prime is 21814843. The next prime is 21814901. The reversal of 21814859 is 95841812.

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 21814859 - 2⁴ = 21814843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21834859) 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, 58142 + ... + 58515.

It is an arithmetic number, because the mean of its divisors is an integer number (3149766).

Almost surely, 2^21814859 is an apocalyptic number.

21814859 is a deficient number, since it is larger than the sum of its proper divisors (3383269).

21814859 is a wasteful number, since it uses less digits than its factorization.

21814859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116685.

The product of its digits is 23040, while the sum is 38.

The square root of 21814859 is about 4670.6379649894. The cubic root of 21814859 is about 279.4156990523.

The spelling of 21814859 in words is "twenty-one million, eight hundred fourteen thousand, eight hundred fifty-nine".