21226136 has 24 divisors (see below), whose sum is σ = 40597020. Its totient is φ = 10402128.

The previous prime is 21226111. The next prime is 21226141. The reversal of 21226136 is 63162212.

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 5 ways as a sum of consecutive naturals, for example, 106565 + ... + 106763.

Almost surely, 2^21226136 is an apocalyptic number.

It is an amenable number.

21226136 is a deficient number, since it is larger than the sum of its proper divisors (19370884).

21226136 is an equidigital number, since it uses as much as digits as its factorization.

21226136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 268 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 21226136 is about 4607.1830873105. The cubic root of 21226136 is about 276.8791889771.

Adding to 21226136 its reverse (63162212), we get a palindrome (84388348).

The spelling of 21226136 in words is "twenty-one million, two hundred twenty-six thousand, one hundred thirty-six".