23221571 has 4 divisors (see below), whose sum is σ = 23239272. Its totient is φ = 23203872.

The previous prime is 23221537. The next prime is 23221631. The reversal of 23221571 is 17512232.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23221571 - 2¹⁸ = 22959427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23221531) 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 3 ways as a sum of consecutive naturals, for example, 6710 + ... + 9563.

It is an arithmetic number, because the mean of its divisors is an integer number (5809818).

Almost surely, 2^23221571 is an apocalyptic number.

23221571 is a deficient number, since it is larger than the sum of its proper divisors (17701).

23221571 is a wasteful number, since it uses less digits than its factorization.

23221571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17700.

The product of its digits is 840, while the sum is 23.

The square root of 23221571 is about 4818.8765288187. The cubic root of 23221571 is about 285.2969962328.

The spelling of 23221571 in words is "twenty-three million, two hundred twenty-one thousand, five hundred seventy-one".