23721113 has 4 divisors (see below), whose sum is σ = 25545828. Its totient is φ = 21896400.

The previous prime is 23721109. The next prime is 23721143. The reversal of 23721113 is 31112732.

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 15264649 + 8456464 = 3907^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 23721113 - 2² = 23721109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23721143) 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, 912338 + ... + 912363.

It is an arithmetic number, because the mean of its divisors is an integer number (6386457).

Almost surely, 2^23721113 is an apocalyptic number.

It is an amenable number.

23721113 is a deficient number, since it is larger than the sum of its proper divisors (1824715).

23721113 is a wasteful number, since it uses less digits than its factorization.

23721113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824714.

The product of its digits is 252, while the sum is 20.

The square root of 23721113 is about 4870.4325269939. The cubic root of 23721113 is about 287.3282674456.

Adding to 23721113 its reverse (31112732), we get a palindrome (54833845).

The spelling of 23721113 in words is "twenty-three million, seven hundred twenty-one thousand, one hundred thirteen".