23016221 has 4 divisors (see below), whose sum is σ = 23033244. Its totient is φ = 22999200.

The previous prime is 23016209. The next prime is 23016247. The reversal of 23016221 is 12261032.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14100025 + 8916196 = 3755^2 + 2986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23016221 is a prime.

It is a deceptive number, since it divides R_23016220.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23016221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23016251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6290 + ... + 9251.

It is an arithmetic number, because the mean of its divisors is an integer number (5758311).

Almost surely, 2^23016221 is an apocalyptic number.

It is an amenable number.

23016221 is a deficient number, since it is larger than the sum of its proper divisors (17023).

23016221 is a wasteful number, since it uses less digits than its factorization.

23016221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17022.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 23016221 is about 4797.5223813965. The cubic root of 23016221 is about 284.4535378777.

Adding to 23016221 its reverse (12261032), we get a palindrome (35277253).

The spelling of 23016221 in words is "twenty-three million, sixteen thousand, two hundred twenty-one".