22012123221 has 32 divisors (see below), whose sum is σ = 36722749440. Its totient is φ = 12910330800.

The previous prime is 22012123193. The next prime is 22012123223. The reversal of 22012123221 is 12232121022.

22012123221 is a `hidden beast` number, since 220 + 121 + 2 + 322 + 1 = 666.

It is not a de Polignac number, because 22012123221 - 2⁶ = 22012123157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22012123194 and 22012123203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012123223) 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, 1186195 + ... + 1204608.

It is an arithmetic number, because the mean of its divisors is an integer number (1147585920).

Almost surely, 2^22012123221 is an apocalyptic number.

It is an amenable number.

22012123221 is a deficient number, since it is larger than the sum of its proper divisors (14710626219).

22012123221 is a wasteful number, since it uses less digits than its factorization.

22012123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390854 (or 2390848 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 22012123221 its reverse (12232121022), we get a palindrome (34244244243).

It can be divided in two parts, 220121 and 23221, that added together give a palindrome (243342).

The spelling of 22012123221 in words is "twenty-two billion, twelve million, one hundred twenty-three thousand, two hundred twenty-one".