22121233223221 has 32 divisors (see below), whose sum is σ = 25215472106496. Its totient is φ = 19224293760000.

The previous prime is 22121233223189. The next prime is 22121233223231. The reversal of 22121233223221 is 12232233212122.

It is a cyclic number.

It is not a de Polignac number, because 22121233223221 - 2⁵ = 22121233223189 is a prime.

It is a super-2 number, since 2×22121233223221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22121233223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121233223231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14171275 + ... + 15654631.

It is an arithmetic number, because the mean of its divisors is an integer number (787983503328).

Almost surely, 2^{22121233223221} is an apocalyptic number.

It is an amenable number.

22121233223221 is a deficient number, since it is larger than the sum of its proper divisors (3094238883275).

22121233223221 is a wasteful number, since it uses less digits than its factorization.

22121233223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483933.

The product of its digits is 6912, while the sum is 28.

Adding to 22121233223221 its reverse (12232233212122), we get a palindrome (34353466435343).

It can be divided in two parts, 221212 and 33223221, that added together give a palindrome (33444433).

The spelling of 22121233223221 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred thirty-three million, two hundred twenty-three thousand, two hundred twenty-one".