21272206 has 8 divisors (see below), whose sum is σ = 32085144. Its totient is φ = 10577160.

The previous prime is 21272189. The next prime is 21272213. The reversal of 21272206 is 60227212.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 29020 + ... + 29743.

It is an arithmetic number, because the mean of its divisors is an integer number (4010643).

Almost surely, 2^21272206 is an apocalyptic number.

21272206 is a deficient number, since it is larger than the sum of its proper divisors (10812938).

21272206 is a wasteful number, since it uses less digits than its factorization.

21272206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58946.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21272206 is about 4612.1801786140. The cubic root of 21272206 is about 277.0793605450.

Adding to 21272206 its reverse (60227212), we get a palindrome (81499418).

The spelling of 21272206 in words is "twenty-one million, two hundred seventy-two thousand, two hundred six".