21232203233 has 4 divisors (see below), whose sum is σ = 22155342528. Its totient is φ = 20309063940.

The previous prime is 21232203169. The next prime is 21232203241. The reversal of 21232203233 is 33230223212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21232203233 - 2⁶ = 21232203169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 923139271 = 21232203233 / (2 + 1 + 2 + 3 + 2 + 2 + 0 + 3 + 2 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232203199 and 21232203208.

It is not an unprimeable number, because it can be changed into a prime (21232203253) 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, 461569613 + ... + 461569658.

It is an arithmetic number, because the mean of its divisors is an integer number (5538835632).

Almost surely, 2^21232203233 is an apocalyptic number.

21232203233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21232203233 is a deficient number, since it is larger than the sum of its proper divisors (923139295).

21232203233 is an equidigital number, since it uses as much as digits as its factorization.

21232203233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923139294.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21232203233 its reverse (33230223212), we get a palindrome (54462426445).

The spelling of 21232203233 in words is "twenty-one billion, two hundred thirty-two million, two hundred three thousand, two hundred thirty-three".