221221202020212 has 24 divisors (see below), whose sum is σ = 517044545640000. Its totient is φ = 73617294826816.

The previous prime is 221221202020171. The next prime is 221221202020229. The reversal of 221221202020212 is 212020202122122.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15388223337 + ... + 15388237712.

It is an arithmetic number, because the mean of its divisors is an integer number (21543522735000).

Almost surely, 2^{221221202020212} is an apocalyptic number.

It is an amenable number.

221221202020212 is an abundant number, since it is smaller than the sum of its proper divisors (295823343619788).

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

221221202020212 is a wasteful number, since it uses less digits than its factorization.

221221202020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30776461655 (or 30776461653 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221221202020212 its reverse (212020202122122), we get a palindrome (433241404142334).

The spelling of 221221202020212 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, twenty thousand, two hundred twelve".