221022202221 has 48 divisors (see below), whose sum is σ = 359141655600. Its totient is φ = 130279532544.

The previous prime is 221022202207. The next prime is 221022202283. The reversal of 221022202221 is 122202220122.

221022202221 is a `hidden beast` number, since 221 + 0 + 2 + 220 + 2 + 221 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 84777057225 + 136245144996 = 291165^2 + 369114^2 .

It is not a de Polignac number, because 221022202221 - 2¹⁵ = 221022169453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221022202194 and 221022202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022202201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 508986 + ... + 837323.

It is an arithmetic number, because the mean of its divisors is an integer number (7482117825).

Almost surely, 2^221022202221 is an apocalyptic number.

It is an amenable number.

221022202221 is a deficient number, since it is larger than the sum of its proper divisors (138119453379).

221022202221 is a wasteful number, since it uses less digits than its factorization.

221022202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346398 (or 1346395 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221022202221 its reverse (122202220122), we get a palindrome (343224422343).

The spelling of 221022202221 in words is "two hundred twenty-one billion, twenty-two million, two hundred two thousand, two hundred twenty-one".