21202303042723 has 4 divisors (see below), whose sum is σ = 23129785137528. Its totient is φ = 19274820947920.

The previous prime is 21202303042717. The next prime is 21202303042729. The reversal of 21202303042723 is 32724030320212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21202303042717) and next prime (21202303042729).

It is a cyclic number.

It is not a de Polignac number, because 21202303042723 - 2⁵ = 21202303042691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202303042729) 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, 963741047386 + ... + 963741047407.

It is an arithmetic number, because the mean of its divisors is an integer number (5782446284382).

Almost surely, 2^{21202303042723} is an apocalyptic number.

21202303042723 is a deficient number, since it is larger than the sum of its proper divisors (1927482094805).

21202303042723 is a wasteful number, since it uses less digits than its factorization.

21202303042723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927482094804.

The product of its (nonzero) digits is 24192, while the sum is 31.

Adding to 21202303042723 its reverse (32724030320212), we get a palindrome (53926333362935).

The spelling of 21202303042723 in words is "twenty-one trillion, two hundred two billion, three hundred three million, forty-two thousand, seven hundred twenty-three".