21132223 has 8 divisors (see below), whose sum is σ = 24314400. Its totient is φ = 17990880.

The previous prime is 21132211. The next prime is 21132229. The reversal of 21132223 is 32223112.

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 21132223 - 2⁵ = 21132191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21132197 and 21132206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132229) 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, 9088 + ... + 11173.

It is an arithmetic number, because the mean of its divisors is an integer number (3039300).

Almost surely, 2^21132223 is an apocalyptic number.

21132223 is a deficient number, since it is larger than the sum of its proper divisors (3182177).

21132223 is a wasteful number, since it uses less digits than its factorization.

21132223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20417.

The product of its digits is 144, while the sum is 16.

The square root of 21132223 is about 4596.9797693703. The cubic root of 21132223 is about 276.4702434768.

Adding to 21132223 its reverse (32223112), we get a palindrome (53355335).

The spelling of 21132223 in words is "twenty-one million, one hundred thirty-two thousand, two hundred twenty-three".