23713786021 has 4 divisors (see below), whose sum is σ = 23752220652. Its totient is φ = 23675351392.

The previous prime is 23713786007. The next prime is 23713786049. The reversal of 23713786021 is 12068731732.

It is a happy number.

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 2528983521 + 21184802500 = 50289^2 + 145550^2 .

It is a cyclic number.

It is not a de Polignac number, because 23713786021 - 2¹⁵ = 23713753253 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23713784021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19216390 + ... + 19217623.

It is an arithmetic number, because the mean of its divisors is an integer number (5938055163).

Almost surely, 2^23713786021 is an apocalyptic number.

It is an amenable number.

23713786021 is a deficient number, since it is larger than the sum of its proper divisors (38434631).

23713786021 is an equidigital number, since it uses as much as digits as its factorization.

23713786021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38434630.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 23713786021 in words is "twenty-three billion, seven hundred thirteen million, seven hundred eighty-six thousand, twenty-one".