23226721 has 8 divisors (see below), whose sum is σ = 27942080. Its totient is φ = 18860688.

The previous prime is 23226691. The next prime is 23226739. The reversal of 23226721 is 12762232.

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

It is not a de Polignac number, because 23226721 - 2⁹ = 23226209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23226521) 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, 87186 + ... + 87451.

It is an arithmetic number, because the mean of its divisors is an integer number (3492760).

Almost surely, 2^23226721 is an apocalyptic number.

It is an amenable number.

23226721 is a deficient number, since it is larger than the sum of its proper divisors (4715359).

23226721 is a wasteful number, since it uses less digits than its factorization.

23226721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174663.

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

The square root of 23226721 is about 4819.4108561109. The cubic root of 23226721 is about 285.3180854021.

Adding to 23226721 its reverse (12762232), we get a palindrome (35988953).

The spelling of 23226721 in words is "twenty-three million, two hundred twenty-six thousand, seven hundred twenty-one".