221020221212 has 48 divisors (see below), whose sum is σ = 443872665600. Its totient is φ = 94330656000.

The previous prime is 221020221187. The next prime is 221020221217. The reversal of 221020221212 is 212122020122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020221217) 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 15 ways as a sum of consecutive naturals, for example, 21248789 + ... + 21259187.

It is an arithmetic number, because the mean of its divisors is an integer number (9247347200).

Almost surely, 2^221020221212 is an apocalyptic number.

It is an amenable number.

221020221212 is an abundant number, since it is smaller than the sum of its proper divisors (222852444388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221020221212 is a wasteful number, since it uses less digits than its factorization.

221020221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13482 (or 13480 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221020221212 its reverse (212122020122), we get a palindrome (433142241334).

The spelling of 221020221212 in words is "two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, two hundred twelve".