21082226 has 16 divisors (see below), whose sum is σ = 35233920. Its totient is φ = 9378480.

The previous prime is 21082213. The next prime is 21082253. The reversal of 21082226 is 62228012.

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, 9161 + ... + 11228.

It is an arithmetic number, because the mean of its divisors is an integer number (2202120).

Almost surely, 2^21082226 is an apocalyptic number.

21082226 is a deficient number, since it is larger than the sum of its proper divisors (14151694).

21082226 is a wasteful number, since it uses less digits than its factorization.

21082226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20449.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21082226 is about 4591.5385221078. The cubic root of 21082226 is about 276.2520364571.

It can be divided in two parts, 2108 and 2226, that added together give a palindrome (4334).

The spelling of 21082226 in words is "twenty-one million, eighty-two thousand, two hundred twenty-six".