22211111101221 has 24 divisors (see below), whose sum is σ = 37656933110784. Its totient is φ = 12349034742240.

The previous prime is 22211111101219. The next prime is 22211111101237. The reversal of 22211111101221 is 12210111111222.

It is a happy number.

22211111101221 is a `hidden beast` number, since 2 + 221 + 111 + 110 + 1 + 221 = 666.

It is not a de Polignac number, because 22211111101221 - 2¹ = 22211111101219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22211111101194 and 22211111101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211111101021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4764285765 + ... + 4764290426.

It is an arithmetic number, because the mean of its divisors is an integer number (1569038879616).

Almost surely, 2^{22211111101221} is an apocalyptic number.

22211111101221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22211111101221 is a deficient number, since it is larger than the sum of its proper divisors (15445822009563).

22211111101221 is a wasteful number, since it uses less digits than its factorization.

22211111101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528576241 (or 9528576238 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 22211111101221 its reverse (12210111111222), we get a palindrome (34421222212443).

The spelling of 22211111101221 in words is "twenty-two trillion, two hundred eleven billion, one hundred eleven million, one hundred one thousand, two hundred twenty-one".