21132323023 has 4 divisors (see below), whose sum is σ = 24151226320. Its totient is φ = 18113419728.

The previous prime is 21132323011. The next prime is 21132323027. The reversal of 21132323023 is 32032323112.

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 21132323023 - 2⁹ = 21132322511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21132322985 and 21132323003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132323027) 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, 1509451638 + ... + 1509451651.

It is an arithmetic number, because the mean of its divisors is an integer number (6037806580).

Almost surely, 2^21132323023 is an apocalyptic number.

21132323023 is a deficient number, since it is larger than the sum of its proper divisors (3018903297).

21132323023 is an equidigital number, since it uses as much as digits as its factorization.

21132323023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018903296.

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

Adding to 21132323023 its reverse (32032323112), we get a palindrome (53164646135).

The spelling of 21132323023 in words is "twenty-one billion, one hundred thirty-two million, three hundred twenty-three thousand, twenty-three".