23661321 has 8 divisors (see below), whose sum is σ = 31669440. Its totient is φ = 15713712.

The previous prime is 23661311. The next prime is 23661343. The reversal of 23661321 is 12316632.

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 23661321 - 2⁹ = 23660809 is a prime.

It is a super-2 number, since 2×23661321² = 1119716222930082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23661291 and 23661300.

It is not an unprimeable number, because it can be changed into a prime (23661311) 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, 14206 + ... + 15783.

It is an arithmetic number, because the mean of its divisors is an integer number (3958680).

Almost surely, 2^23661321 is an apocalyptic number.

It is an amenable number.

23661321 is a deficient number, since it is larger than the sum of its proper divisors (8008119).

23661321 is a wasteful number, since it uses less digits than its factorization.

23661321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30255.

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

The square root of 23661321 is about 4864.2903901803. The cubic root of 23661321 is about 287.0866488401.

Adding to 23661321 its reverse (12316632), we get a palindrome (35977953).

The spelling of 23661321 in words is "twenty-three million, six hundred sixty-one thousand, three hundred twenty-one".