21641226 has 32 divisors (see below), whose sum is σ = 45111168. Its totient is φ = 6914880.

The previous prime is 21641203. The next prime is 21641231. The reversal of 21641226 is 62214612.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21641196 and 21641205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15076 + ... + 16448.

It is an arithmetic number, because the mean of its divisors is an integer number (1409724).

Almost surely, 2^21641226 is an apocalyptic number.

21641226 is an abundant number, since it is smaller than the sum of its proper divisors (23469942).

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

21641226 is a wasteful number, since it uses less digits than its factorization.

21641226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486.

The product of its digits is 1152, while the sum is 24.

The square root of 21641226 is about 4652.0131126212. The cubic root of 21641226 is about 278.6723971741.

Adding to 21641226 its reverse (62214612), we get a palindrome (83855838).

The spelling of 21641226 in words is "twenty-one million, six hundred forty-one thousand, two hundred twenty-six".