21226455 has 40 divisors (see below), whose sum is σ = 40301712. Its totient is φ = 10651392.

The previous prime is 21226453. The next prime is 21226481. The reversal of 21226455 is 55462212.

21226455 is a `hidden beast` number, since 2 + 12 + 2 + 645 + 5 = 666.

It is not a de Polignac number, because 21226455 - 2¹ = 21226453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226451) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5344 + ... + 8426.

Almost surely, 2^21226455 is an apocalyptic number.

21226455 is a deficient number, since it is larger than the sum of its proper divisors (19075257).

21226455 is a wasteful number, since it uses less digits than its factorization.

21226455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117 (or 3108 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 21226455 is about 4607.2177070332. The cubic root of 21226455 is about 276.8805760095.

Adding to 21226455 its reverse (55462212), we get a palindrome (76688667).

The spelling of 21226455 in words is "twenty-one million, two hundred twenty-six thousand, four hundred fifty-five".