21323120023 has 2 divisors, whose sum is σ = 21323120024. Its totient is φ = 21323120022.

The previous prime is 21323119921. The next prime is 21323120047. The reversal of 21323120023 is 32002132312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323120023 - 2²⁹ = 20786249111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323120083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661560011 + 10661560012.

It is an arithmetic number, because the mean of its divisors is an integer number (10661560012).

Almost surely, 2^21323120023 is an apocalyptic number.

21323120023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323120023 is an equidigital number, since it uses as much as digits as its factorization.

21323120023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21323120023 its reverse (32002132312), we get a palindrome (53325252335).

The spelling of 21323120023 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, twenty-three".