21226135 has 32 divisors (see below), whose sum is σ = 31219200. Its totient is φ = 13530240.

The previous prime is 21226111. The next prime is 21226141. The reversal of 21226135 is 53162212.

It is not a de Polignac number, because 21226135 - 2¹¹ = 21224087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38965 + ... + 39505.

It is an arithmetic number, because the mean of its divisors is an integer number (975600).

Almost surely, 2^21226135 is an apocalyptic number.

21226135 is a deficient number, since it is larger than the sum of its proper divisors (9993065).

21226135 is a wasteful number, since it uses less digits than its factorization.

21226135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631.

The product of its digits is 720, while the sum is 22.

The square root of 21226135 is about 4607.1829787843. The cubic root of 21226135 is about 276.8791846290.

Adding to 21226135 its reverse (53162212), we get a palindrome (74388347).

The spelling of 21226135 in words is "twenty-one million, two hundred twenty-six thousand, one hundred thirty-five".