23638450839721 has 3 divisors (see below), whose sum is σ = 23638455701661. Its totient is φ = 23638445977782.

The previous prime is 23638450839631. The next prime is 23638450839727. The reversal of 23638450839721 is 12793805483632.

The square root of 23638450839721 is 4861939.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 23638450839721 - 2¹⁵ = 23638450806953 is a prime.

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 23638450839721.

It is not an unprimeable number, because it can be changed into a prime (23638450839727) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2430970 + ... + 7292908.

It is an arithmetic number, because the mean of its divisors is an integer number (7879485233887).

It is a 1-persistent number, because it is pandigital, but 2⋅23638450839721 = 47276901679442 is not.

Almost surely, 2^{23638450839721} is an apocalyptic number.

23638450839721 is the 4861939-th square number.

23638450839721 is the 2430970-th centered octagonal number.

It is an amenable number.

23638450839721 is a deficient number, since it is larger than the sum of its proper divisors (4861940).

23638450839721 is an frugal number, since it uses more digits than its factorization.

23638450839721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9723878 (or 4861939 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 61.

The spelling of 23638450839721 in words is "twenty-three trillion, six hundred thirty-eight billion, four hundred fifty million, eight hundred thirty-nine thousand, seven hundred twenty-one".