21132023 has 8 divisors (see below), whose sum is σ = 23101200. Its totient is φ = 19170880.

The previous prime is 21132011. The next prime is 21132061. The reversal of 21132023 is 32023112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21132023 - 2⁶ = 21131959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131989 and 21132007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4403 + ... + 7851.

It is an arithmetic number, because the mean of its divisors is an integer number (2887650).

Almost surely, 2^21132023 is an apocalyptic number.

21132023 is a deficient number, since it is larger than the sum of its proper divisors (1969177).

21132023 is a wasteful number, since it uses less digits than its factorization.

21132023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21132023 is about 4596.9580159057. The cubic root of 21132023 is about 276.4693712823.

Adding to 21132023 its reverse (32023112), we get a palindrome (53155135).

The spelling of 21132023 in words is "twenty-one million, one hundred thirty-two thousand, twenty-three".