21226411 has 4 divisors (see below), whose sum is σ = 21465000. Its totient is φ = 20987824.

The previous prime is 21226409. The next prime is 21226417. The reversal of 21226411 is 11462212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21226411 - 2¹ = 21226409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119161 + ... + 119338.

It is an arithmetic number, because the mean of its divisors is an integer number (5366250).

Almost surely, 2^21226411 is an apocalyptic number.

21226411 is a deficient number, since it is larger than the sum of its proper divisors (238589).

21226411 is an equidigital number, since it uses as much as digits as its factorization.

21226411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238588.

The product of its digits is 192, while the sum is 19.

The square root of 21226411 is about 4607.2129319145. The cubic root of 21226411 is about 276.8803846955.

Adding to 21226411 its reverse (11462212), we get a palindrome (32688623).

The spelling of 21226411 in words is "twenty-one million, two hundred twenty-six thousand, four hundred eleven".