22111010211221 has 4 divisors (see below), whose sum is σ = 22650303143244. Its totient is φ = 21571717279200.

The previous prime is 22111010211209. The next prime is 22111010211293. The reversal of 22111010211221 is 12211201011122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8550653222500 + 13560356988721 = 2924150^2 + 3682439^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111010211221 - 2¹⁴ = 22111010194837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22111010211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111010214221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269646465950 + ... + 269646466031.

It is an arithmetic number, because the mean of its divisors is an integer number (5662575785811).

Almost surely, 2^{22111010211221} is an apocalyptic number.

It is an amenable number.

22111010211221 is a deficient number, since it is larger than the sum of its proper divisors (539292932023).

22111010211221 is an equidigital number, since it uses as much as digits as its factorization.

22111010211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539292932022.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 22111010211221 its reverse (12211201011122), we get a palindrome (34322211222343).

The spelling of 22111010211221 in words is "twenty-two trillion, one hundred eleven billion, ten million, two hundred eleven thousand, two hundred twenty-one".