21449859 has 8 divisors (see below), whose sum is σ = 28631232. Its totient is φ = 14284200.

The previous prime is 21449851. The next prime is 21449887. The reversal of 21449859 is 95894412.

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

It is not a de Polignac number, because 21449859 - 2³ = 21449851 is a prime.

It is a super-2 number, since 2×21449859² = 920192902239762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21449859.

It is not an unprimeable number, because it can be changed into a prime (21449851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249 + ... + 6554.

It is an arithmetic number, because the mean of its divisors is an integer number (3578904).

Almost surely, 2^21449859 is an apocalyptic number.

21449859 is a deficient number, since it is larger than the sum of its proper divisors (7181373).

21449859 is a wasteful number, since it uses less digits than its factorization.

21449859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857.

The product of its digits is 103680, while the sum is 42.

The square root of 21449859 is about 4631.3992486073. The cubic root of 21449859 is about 277.8485580282.

The spelling of 21449859 in words is "twenty-one million, four hundred forty-nine thousand, eight hundred fifty-nine".