21272586 has 16 divisors (see below), whose sum is σ = 42660864. Its totient is φ = 7071584.

The previous prime is 21272579. The next prime is 21272611. The reversal of 21272586 is 68527212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2331 + ... + 6926.

It is an arithmetic number, because the mean of its divisors is an integer number (2666304).

Almost surely, 2^21272586 is an apocalyptic number.

21272586 is an abundant number, since it is smaller than the sum of its proper divisors (21388278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21272586 is a wasteful number, since it uses less digits than its factorization.

21272586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9645.

The product of its digits is 13440, while the sum is 33.

The square root of 21272586 is about 4612.2213736984. The cubic root of 21272586 is about 277.0810104214.

Adding to 21272586 its reverse (68527212), we get a palindrome (89799798).

The spelling of 21272586 in words is "twenty-one million, two hundred seventy-two thousand, five hundred eighty-six".