21232221233 has 4 divisors (see below), whose sum is σ = 21239304000. Its totient is φ = 21225138468.

The previous prime is 21232221217. The next prime is 21232221259. The reversal of 21232221233 is 33212223212.

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 a cyclic number.

It is not a de Polignac number, because 21232221233 - 2⁴ = 21232221217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232221199 and 21232221208.

It is not an unprimeable number, because it can be changed into a prime (21232221293) 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, 3536885 + ... + 3542882.

It is an arithmetic number, because the mean of its divisors is an integer number (5309826000).

Almost surely, 2^21232221233 is an apocalyptic number.

It is an amenable number.

21232221233 is a deficient number, since it is larger than the sum of its proper divisors (7082767).

21232221233 is an equidigital number, since it uses as much as digits as its factorization.

21232221233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082766.

The product of its digits is 1728, while the sum is 23.

Adding to 21232221233 its reverse (33212223212), we get a palindrome (54444444445).

The spelling of 21232221233 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-one thousand, two hundred thirty-three".