21226273 has 8 divisors (see below), whose sum is σ = 21660800. Its totient is φ = 20796048.

The previous prime is 21226241. The next prime is 21226277. The reversal of 21226273 is 37262212.

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

It is a cyclic number.

It is not a de Polignac number, because 21226273 - 2⁵ = 21226241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226277) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10015 + ... + 11947.

It is an arithmetic number, because the mean of its divisors is an integer number (2707600).

Almost surely, 2^21226273 is an apocalyptic number.

It is an amenable number.

21226273 is a deficient number, since it is larger than the sum of its proper divisors (434527).

21226273 is a wasteful number, since it uses less digits than its factorization.

21226273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151.

The product of its digits is 2016, while the sum is 25.

The square root of 21226273 is about 4607.1979553737. The cubic root of 21226273 is about 276.8797846636.

Adding to 21226273 its reverse (37262212), we get a palindrome (58488485).

The spelling of 21226273 in words is "twenty-one million, two hundred twenty-six thousand, two hundred seventy-three".