2221220211221 has 16 divisors (see below), whose sum is σ = 2442556151808. Its totient is φ = 2003123001600.

The previous prime is 2221220211211. The next prime is 2221220211227. The reversal of 2221220211221 is 1221120221222.

It is a cyclic number.

It is not a de Polignac number, because 2221220211221 - 2¹⁰ = 2221220210197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221220211193 and 2221220211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221220211227) 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, 10728401 + ... + 10933481.

It is an arithmetic number, because the mean of its divisors is an integer number (152659759488).

Almost surely, 2^{2221220211221} is an apocalyptic number.

It is an amenable number.

2221220211221 is a deficient number, since it is larger than the sum of its proper divisors (221335940587).

2221220211221 is a wasteful number, since it uses less digits than its factorization.

2221220211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212972.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221220211221 its reverse (1221120221222), we get a palindrome (3442340432443).

The spelling of 2221220211221 in words is "two trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".