23213661 has 8 divisors (see below), whose sum is σ = 30973824. Its totient is φ = 15464640.

The previous prime is 23213657. The next prime is 23213669. The reversal of 23213661 is 16631232.

It is a happy number.

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

It is not a de Polignac number, because 23213661 - 2² = 23213657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6565 + ... + 9461.

It is an arithmetic number, because the mean of its divisors is an integer number (3871728).

Almost surely, 2^23213661 is an apocalyptic number.

It is an amenable number.

23213661 is a deficient number, since it is larger than the sum of its proper divisors (7760163).

23213661 is a wasteful number, since it uses less digits than its factorization.

23213661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5571.

The product of its digits is 1296, while the sum is 24.

The square root of 23213661 is about 4818.0557281958. The cubic root of 23213661 is about 285.2645988335.

Adding to 23213661 its reverse (16631232), we get a palindrome (39844893).

The spelling of 23213661 in words is "twenty-three million, two hundred thirteen thousand, six hundred sixty-one".