21323213023 has 16 divisors (see below), whose sum is σ = 24672404736. Its totient is φ = 18049944960.

The previous prime is 21323212997. The next prime is 21323213027. The reversal of 21323213023 is 32031232312.

It is a cyclic number.

It is not a de Polignac number, because 21323213023 - 2²⁹ = 20786342111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323212985 and 21323213003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323213027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2023015 + ... + 2033527.

It is an arithmetic number, because the mean of its divisors is an integer number (1542025296).

Almost surely, 2^21323213023 is an apocalyptic number.

21323213023 is a deficient number, since it is larger than the sum of its proper divisors (3349191713).

21323213023 is a wasteful number, since it uses less digits than its factorization.

21323213023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14094.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21323213023 its reverse (32031232312), we get a palindrome (53354445335).

The spelling of 21323213023 in words is "twenty-one billion, three hundred twenty-three million, two hundred thirteen thousand, twenty-three".