21226465 has 8 divisors (see below), whose sum is σ = 27431208. Its totient is φ = 15674880.

The previous prime is 21226453. The next prime is 21226481. The reversal of 21226465 is 56462212.

It can be written as a sum of positive squares in 4 ways, for example, as 904401 + 20322064 = 951^2 + 4508^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21226465 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 163216 + ... + 163345.

It is an arithmetic number, because the mean of its divisors is an integer number (3428901).

Almost surely, 2^21226465 is an apocalyptic number.

It is an amenable number.

21226465 is a deficient number, since it is larger than the sum of its proper divisors (6204743).

21226465 is a wasteful number, since it uses less digits than its factorization.

21226465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326579.

The product of its digits is 5760, while the sum is 28.

The square root of 21226465 is about 4607.2187922867. The cubic root of 21226465 is about 276.8806194900.

Adding to 21226465 its reverse (56462212), we get a palindrome (77688677).

The spelling of 21226465 in words is "twenty-one million, two hundred twenty-six thousand, four hundred sixty-five".