21233222121 has 32 divisors (see below), whose sum is σ = 28989890560. Its totient is φ = 13820279616.

The previous prime is 21233222089. The next prime is 21233222141. The reversal of 21233222121 is 12122233212.

It is not a de Polignac number, because 21233222121 - 2⁵ = 21233222089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233222141) 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 31 ways as a sum of consecutive naturals, for example, 19533240 + ... + 19534326.

It is an arithmetic number, because the mean of its divisors is an integer number (905934080).

Almost surely, 2^21233222121 is an apocalyptic number.

It is an amenable number.

21233222121 is a deficient number, since it is larger than the sum of its proper divisors (7756668439).

21233222121 is a wasteful number, since it uses less digits than its factorization.

21233222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its digits is 576, while the sum is 21.

Adding to 21233222121 its reverse (12122233212), we get a palindrome (33355455333).

The spelling of 21233222121 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-two thousand, one hundred twenty-one".