23212561 has 8 divisors (see below), whose sum is σ = 23918400. Its totient is φ = 22514352.

The previous prime is 23212559. The next prime is 23212591. The reversal of 23212561 is 16521232.

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 23212561 - 2¹ = 23212559 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23212591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4596 + ... + 8218.

It is an arithmetic number, because the mean of its divisors is an integer number (2989800).

Almost surely, 2^23212561 is an apocalyptic number.

It is an amenable number.

23212561 is a deficient number, since it is larger than the sum of its proper divisors (705839).

23212561 is a wasteful number, since it uses less digits than its factorization.

23212561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815.

The product of its digits is 720, while the sum is 22.

The square root of 23212561 is about 4817.9415729126. The cubic root of 23212561 is about 285.2600929233.

Adding to 23212561 its reverse (16521232), we get a palindrome (39733793).

The spelling of 23212561 in words is "twenty-three million, two hundred twelve thousand, five hundred sixty-one".