221020212212 has 48 divisors (see below), whose sum is σ = 439494249600. Its totient is φ = 96688690560.

The previous prime is 221020212211. The next prime is 221020212247. The reversal of 221020212212 is 212212020122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020212211) 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, 2129339 + ... + 2230722.

It is an arithmetic number, because the mean of its divisors is an integer number (9156130200).

Almost surely, 2^221020212212 is an apocalyptic number.

It is an amenable number.

221020212212 is a deficient number, since it is larger than the sum of its proper divisors (218474037388).

221020212212 is a wasteful number, since it uses less digits than its factorization.

221020212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360136 (or 4360134 counting only the distinct ones).

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

Adding to 221020212212 its reverse (212212020122), we get a palindrome (433232232334).

The spelling of 221020212212 in words is "two hundred twenty-one billion, twenty million, two hundred twelve thousand, two hundred twelve".