21267859 has 8 divisors (see below), whose sum is σ = 22993040. Its totient is φ = 19603296.

The previous prime is 21267853. The next prime is 21267863. The reversal of 21267859 is 95876212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21267859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21267853) 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, 14424 + ... + 15829.

It is an arithmetic number, because the mean of its divisors is an integer number (2874130).

Almost surely, 2^21267859 is an apocalyptic number.

21267859 is a deficient number, since it is larger than the sum of its proper divisors (1725181).

21267859 is a wasteful number, since it uses less digits than its factorization.

21267859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30309.

The product of its digits is 60480, while the sum is 40.

The square root of 21267859 is about 4611.7089023485. The cubic root of 21267859 is about 277.0604854296.

The spelling of 21267859 in words is "twenty-one million, two hundred sixty-seven thousand, eight hundred fifty-nine".