21323333231023 has 4 divisors (see below), whose sum is σ = 21446589492648. Its totient is φ = 21200076969400.

The previous prime is 21323333231003. The next prime is 21323333231029. The reversal of 21323333231023 is 32013233332312.

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

It is a cyclic number.

It is not a de Polignac number, because 21323333231023 - 2²⁹ = 21322796360111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323333231029) 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, 61628130553 + ... + 61628130898.

It is an arithmetic number, because the mean of its divisors is an integer number (5361647373162).

Almost surely, 2^{21323333231023} is an apocalyptic number.

21323333231023 is a deficient number, since it is larger than the sum of its proper divisors (123256261625).

21323333231023 is a wasteful number, since it uses less digits than its factorization.

21323333231023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123256261624.

The product of its (nonzero) digits is 34992, while the sum is 31.

Adding to 21323333231023 its reverse (32013233332312), we get a palindrome (53336566563335).

The spelling of 21323333231023 in words is "twenty-one trillion, three hundred twenty-three billion, three hundred thirty-three million, two hundred thirty-one thousand, twenty-three".