22122123221 has 16 divisors (see below), whose sum is σ = 24813202176. Its totient is φ = 19548000000.

The previous prime is 22122123217. The next prime is 22122123241. The reversal of 22122123221 is 12232122122.

It is a cyclic number.

It is not a de Polignac number, because 22122123221 - 2² = 22122123217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22122123193 and 22122123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122123241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31721 + ... + 212721.

It is an arithmetic number, because the mean of its divisors is an integer number (1550825136).

Almost surely, 2^22122123221 is an apocalyptic number.

It is an amenable number.

22122123221 is a deficient number, since it is larger than the sum of its proper divisors (2691078955).

22122123221 is a wasteful number, since it uses less digits than its factorization.

22122123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181324.

The product of its digits is 384, while the sum is 20.

Adding to 22122123221 its reverse (12232122122), we get a palindrome (34354245343).

It can be divided in two parts, 221221 and 23221, that added together give a palindrome (244442).

The spelling of 22122123221 in words is "twenty-two billion, one hundred twenty-two million, one hundred twenty-three thousand, two hundred twenty-one".