221211022221 has 16 divisors (see below), whose sum is σ = 374537180800. Its totient is φ = 126406298304.

The previous prime is 221211022199. The next prime is 221211022327. The reversal of 221211022221 is 122220112122.

It is a happy number.

It is not a de Polignac number, because 221211022221 - 2⁶ = 221211022157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211022194 and 221211022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211022421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585214156 + ... + 585214533.

It is an arithmetic number, because the mean of its divisors is an integer number (23408573800).

Almost surely, 2^221211022221 is an apocalyptic number.

221211022221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221211022221 is a deficient number, since it is larger than the sum of its proper divisors (153326158579).

221211022221 is a wasteful number, since it uses less digits than its factorization.

221211022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170428705 (or 1170428699 counting only the distinct ones).

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

Adding to 221211022221 its reverse (122220112122), we get a palindrome (343431134343).

The spelling of 221211022221 in words is "two hundred twenty-one billion, two hundred eleven million, twenty-two thousand, two hundred twenty-one".