2023813721 has 4 divisors (see below), whose sum is σ = 2024072244. Its totient is φ = 2023555200.

The previous prime is 2023813663. The next prime is 2023813741. The reversal of 2023813721 is 1273183202.

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 1531861321 + 491952400 = 39139^2 + 22180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2023813721 - 2²⁶ = 1956704857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2023813741) 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, 117140 + ... + 133301.

It is an arithmetic number, because the mean of its divisors is an integer number (506018061).

Almost surely, 2^2023813721 is an apocalyptic number.

It is an amenable number.

2023813721 is a deficient number, since it is larger than the sum of its proper divisors (258523).

2023813721 is an equidigital number, since it uses as much as digits as its factorization.

2023813721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258522.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 2023813721 is about 44986.8171912617. The cubic root of 2023813721 is about 1264.9019011869.

Adding to 2023813721 its reverse (1273183202), we get a palindrome (3296996923).

The spelling of 2023813721 in words is "two billion, twenty-three million, eight hundred thirteen thousand, seven hundred twenty-one".