22122022221 has 48 divisors (see below), whose sum is σ = 36484302400. Its totient is φ = 12804086016.

The previous prime is 22122022207. The next prime is 22122022229. The reversal of 22122022221 is 12222022122.

22122022221 is a `hidden beast` number, since 221 + 220 + 2 + 2 + 221 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-22122022221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22122022194 and 22122022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122022229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 273201 + ... + 344793.

Almost surely, 2^22122022221 is an apocalyptic number.

It is an amenable number.

22122022221 is a deficient number, since it is larger than the sum of its proper divisors (14362280179).

22122022221 is a wasteful number, since it uses less digits than its factorization.

22122022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71770 (or 71767 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22122022221 its reverse (12222022122), we get a palindrome (34344044343).

Subtracting from 22122022221 its reverse (12222022122), we obtain a palindrome (9900000099).

The spelling of 22122022221 in words is "twenty-two billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-one".