11212222211221 has 8 divisors (see below), whose sum is σ = 12387928377024. Its totient is φ = 10093867565760.

The previous prime is 11212222211173. The next prime is 11212222211227. The reversal of 11212222211221 is 12211222221211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11212222211221 - 2¹⁷ = 11212222080149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212222211192 and 11212222211201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212222211227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14337879675 + ... + 14337880456.

It is an arithmetic number, because the mean of its divisors is an integer number (1548491047128).

Almost surely, 2^{11212222211221} is an apocalyptic number.

It is an amenable number.

11212222211221 is a deficient number, since it is larger than the sum of its proper divisors (1175706165803).

11212222211221 is a wasteful number, since it uses less digits than its factorization.

11212222211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28675760171.

The product of its digits is 256, while the sum is 22.

Adding to 11212222211221 its reverse (12211222221211), we get a palindrome (23423444432432).

The spelling of 11212222211221 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".