22122220221 has 6 divisors (see below), whose sum is σ = 31954318110. Its totient is φ = 14748146808.

The previous prime is 22122220151. The next prime is 22122220223. The reversal of 22122220221 is 12202222122.

22122220221 is a `hidden beast` number, since 221 + 2 + 2 + 220 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19492068996 + 2630151225 = 139614^2 + 51285^2 .

It is not a de Polignac number, because 22122220221 - 2¹⁵ = 22122187453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22122220194 and 22122220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122220223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1229012226 + ... + 1229012243.

It is an arithmetic number, because the mean of its divisors is an integer number (5325719685).

Almost surely, 2^22122220221 is an apocalyptic number.

It is an amenable number.

22122220221 is a deficient number, since it is larger than the sum of its proper divisors (9832097889).

22122220221 is a wasteful number, since it uses less digits than its factorization.

22122220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458024475 (or 2458024472 counting only the distinct ones).

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

Adding to 22122220221 its reverse (12202222122), we get a palindrome (34324442343).

The spelling of 22122220221 in words is "twenty-two billion, one hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".