23653100021 has 4 divisors (see below), whose sum is σ = 23667376332. Its totient is φ = 23638823712.

The previous prime is 23653099969. The next prime is 23653100027. The reversal of 23653100021 is 12000135632.

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 18307443025 + 5345656996 = 135305^2 + 73114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23653100021 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 23653100021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23653100027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7135670 + ... + 7138983.

It is an arithmetic number, because the mean of its divisors is an integer number (5916844083).

Almost surely, 2^23653100021 is an apocalyptic number.

It is an amenable number.

23653100021 is a deficient number, since it is larger than the sum of its proper divisors (14276311).

23653100021 is a wasteful number, since it uses less digits than its factorization.

23653100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14276310.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 23653100021 its reverse (12000135632), we get a palindrome (35653235653).

The spelling of 23653100021 in words is "twenty-three billion, six hundred fifty-three million, one hundred thousand, twenty-one".