2221011221 has 32 divisors (see below), whose sum is σ = 2641766400. Its totient is φ = 1840780800.

The previous prime is 2221011187. The next prime is 2221011227. The reversal of 2221011221 is 1221101222.

It is a cyclic number.

It is not a de Polignac number, because 2221011221 - 2⁶ = 2221011157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221011196 and 2221011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221011227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6363755 + ... + 6364103.

It is an arithmetic number, because the mean of its divisors is an integer number (82555200).

Almost surely, 2^2221011221 is an apocalyptic number.

It is an amenable number.

2221011221 is a deficient number, since it is larger than the sum of its proper divisors (420755179).

2221011221 is a wasteful number, since it uses less digits than its factorization.

2221011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2221011221 is about 47127.6057210633. The cubic root of 2221011221 is about 1304.7187918423.

Adding to 2221011221 its reverse (1221101222), we get a palindrome (3442112443).

Subtracting from 2221011221 its reverse (1221101222), we obtain a palindrome (999909999).

It can be divided in two parts, 222101 and 1221, that added together give a palindrome (223322).

The spelling of 2221011221 in words is "two billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".