21221224233 has 16 divisors (see below), whose sum is σ = 31052077056. Its totient is φ = 12784330640.

The previous prime is 21221224217. The next prime is 21221224243. The reversal of 21221224233 is 33242212212.

It is a cyclic number.

It is not a de Polignac number, because 21221224233 - 2⁴ = 21221224217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221224243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1919841 + ... + 1930862.

It is an arithmetic number, because the mean of its divisors is an integer number (1940754816).

Almost surely, 2^21221224233 is an apocalyptic number.

It is an amenable number.

21221224233 is a deficient number, since it is larger than the sum of its proper divisors (9830852823).

21221224233 is a wasteful number, since it uses less digits than its factorization.

21221224233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850884.

The product of its digits is 2304, while the sum is 24.

Adding to 21221224233 its reverse (33242212212), we get a palindrome (54463436445).

The spelling of 21221224233 in words is "twenty-one billion, two hundred twenty-one million, two hundred twenty-four thousand, two hundred thirty-three".