21233222221 has 8 divisors (see below), whose sum is σ = 21373164864. Its totient is φ = 21093397920.

The previous prime is 21233222183. The next prime is 21233222293. The reversal of 21233222221 is 12222233212.

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 21233222221 - 2¹⁷ = 21233091149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233222192 and 21233222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233232221) 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, 346056 + ... + 402766.

It is an arithmetic number, because the mean of its divisors is an integer number (2671645608).

Almost surely, 2^21233222221 is an apocalyptic number.

It is an amenable number.

21233222221 is a deficient number, since it is larger than the sum of its proper divisors (139942643).

21233222221 is a wasteful number, since it uses less digits than its factorization.

21233222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59171.

The product of its digits is 1152, while the sum is 22.

Adding to 21233222221 its reverse (12222233212), we get a palindrome (33455455433).

The spelling of 21233222221 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-two thousand, two hundred twenty-one".