221221202211 has 24 divisors (see below), whose sum is σ = 336386640720. Its totient is φ = 139707472896.

The previous prime is 221221202149. The next prime is 221221202227. The reversal of 221221202211 is 112202122122.

It is a happy number.

221221202211 is a `hidden beast` number, since 221 + 221 + 2 + 0 + 221 + 1 = 666.

221221202211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-221221202211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221202261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2441331 + ... + 2530323.

It is an arithmetic number, because the mean of its divisors is an integer number (14016110030).

Almost surely, 2^221221202211 is an apocalyptic number.

221221202211 is a deficient number, since it is larger than the sum of its proper divisors (115165438509).

221221202211 is a wasteful number, since it uses less digits than its factorization.

221221202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103555 (or 103552 counting only the distinct ones).

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

Adding to 221221202211 its reverse (112202122122), we get a palindrome (333423324333).

The spelling of 221221202211 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, two hundred eleven".