22111211112221 has 16 divisors (see below), whose sum is σ = 27765549611520. Its totient is φ = 17105561797680.

The previous prime is 22111211112209. The next prime is 22111211112227. The reversal of 22111211112221 is 12221111211122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22111211112221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22111211112193 and 22111211112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111211112227) 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, 1032933851 + ... + 1032955256.

It is an arithmetic number, because the mean of its divisors is an integer number (1735346850720).

Almost surely, 2^{22111211112221} is an apocalyptic number.

It is an amenable number.

22111211112221 is a deficient number, since it is larger than the sum of its proper divisors (5654338499299).

22111211112221 is a wasteful number, since it uses less digits than its factorization.

22111211112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065889264.

The product of its digits is 64, while the sum is 20.

Adding to 22111211112221 its reverse (12221111211122), we get a palindrome (34332322323343).

The spelling of 22111211112221 in words is "twenty-two trillion, one hundred eleven billion, two hundred eleven million, one hundred twelve thousand, two hundred twenty-one".