22111211122221 has 16 divisors (see below), whose sum is σ = 31754965828544. Its totient is φ = 13604527234944.

The previous prime is 22111211122193. The next prime is 22111211122261. The reversal of 22111211122221 is 12222111211122.

It is not a de Polignac number, because 22111211122221 - 2¹⁸ = 22111210860077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111211122261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49188331 + ... + 49635816.

It is an arithmetic number, because the mean of its divisors is an integer number (1984685364284).

Almost surely, 2^{22111211122221} is an apocalyptic number.

It is an amenable number.

22111211122221 is a deficient number, since it is larger than the sum of its proper divisors (9643754706323).

22111211122221 is a wasteful number, since it uses less digits than its factorization.

22111211122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98829900.

The product of its digits is 128, while the sum is 21.

Adding to 22111211122221 its reverse (12222111211122), we get a palindrome (34333322333343).

The spelling of 22111211122221 in words is "twenty-two trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".