21226653 has 36 divisors (see below), whose sum is σ = 36042240. Its totient is φ = 12002256.

The previous prime is 21226633. The next prime is 21226663. The reversal of 21226653 is 35662212.

21226653 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 6 + 653 = 666.

It is not a de Polignac number, because 21226653 - 2⁹ = 21226141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226603) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 55818 + ... + 56196.

Almost surely, 2^21226653 is an apocalyptic number.

It is an amenable number.

21226653 is a deficient number, since it is larger than the sum of its proper divisors (14815587).

21226653 is a wasteful number, since it uses less digits than its factorization.

21226653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 516 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 21226653 is about 4607.2391950061. The cubic root of 21226653 is about 276.8814369192.

Adding to 21226653 its reverse (35662212), we get a palindrome (56888865).

The spelling of 21226653 in words is "twenty-one million, two hundred twenty-six thousand, six hundred fifty-three".