21272859 has 6 divisors (see below), whose sum is σ = 30727476. Its totient is φ = 14181900.

The previous prime is 21272843. The next prime is 21272947. The reversal of 21272859 is 95827212.

It is not a de Polignac number, because 21272859 - 2⁴ = 21272843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21272819) 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 5 ways as a sum of consecutive naturals, for example, 1181817 + ... + 1181834.

It is an arithmetic number, because the mean of its divisors is an integer number (5121246).

Almost surely, 2^21272859 is an apocalyptic number.

21272859 is a deficient number, since it is larger than the sum of its proper divisors (9454617).

21272859 is a wasteful number, since it uses less digits than its factorization.

21272859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363657 (or 2363654 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 21272859 is about 4612.2509688871. The cubic root of 21272859 is about 277.0821957152.

The spelling of 21272859 in words is "twenty-one million, two hundred seventy-two thousand, eight hundred fifty-nine".