23643007921 has 8 divisors (see below), whose sum is σ = 25570981800. Its totient is φ = 21730645632.

The previous prime is 23643007909. The next prime is 23643007951. The reversal of 23643007921 is 12970034632.

It can be written as a sum of positive squares in 4 ways, for example, as 1489960000 + 22153047921 = 38600^2 + 148839^2 .

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 23643007921 - 2¹¹ = 23643005873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23643007901) 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, 3899746 + ... + 3905803.

It is an arithmetic number, because the mean of its divisors is an integer number (3196372725).

Almost surely, 2^23643007921 is an apocalyptic number.

It is an amenable number.

23643007921 is a deficient number, since it is larger than the sum of its proper divisors (1927973879).

23643007921 is a wasteful number, since it uses less digits than its factorization.

23643007921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7805795.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 23643007921 in words is "twenty-three billion, six hundred forty-three million, seven thousand, nine hundred twenty-one".