2221022011221 has 24 divisors (see below), whose sum is σ = 3474011134776. Its totient is φ = 1359231477120.

The previous prime is 2221022011207. The next prime is 2221022011253. The reversal of 2221022011221 is 1221102201222.

It is a happy number.

2221022011221 is a `hidden beast` number, since 2 + 2 + 210 + 220 + 11 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 68607324900 + 2152414686321 = 261930^2 + 1467111^2 .

It is not a de Polignac number, because 2221022011221 - 2¹⁷ = 2221021880149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221022011194 and 2221022011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221022011721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52418310 + ... + 52460663.

It is an arithmetic number, because the mean of its divisors is an integer number (144750463949).

Almost surely, 2^{2221022011221} is an apocalyptic number.

It is an amenable number.

2221022011221 is a deficient number, since it is larger than the sum of its proper divisors (1252989123555).

2221022011221 is a wasteful number, since it uses less digits than its factorization.

2221022011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104879173 (or 104879170 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2221022011221 its reverse (1221102201222), we get a palindrome (3442124212443).

The spelling of 2221022011221 in words is "two trillion, two hundred twenty-one billion, twenty-two million, eleven thousand, two hundred twenty-one".