221212221220212 has 24 divisors (see below), whose sum is σ = 521961420859200. Its totient is φ = 72908896881216.

The previous prime is 221212221220157. The next prime is 221212221220217. The reversal of 221212221220212 is 212022122212122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212221220217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103563772912 + ... + 103563775047.

It is an arithmetic number, because the mean of its divisors is an integer number (21748392535800).

Almost surely, 2^{221212221220212} is an apocalyptic number.

It is an amenable number.

221212221220212 is an abundant number, since it is smaller than the sum of its proper divisors (300749199638988).

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

221212221220212 is a wasteful number, since it uses less digits than its factorization.

221212221220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207127548055 (or 207127548053 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 221212221220212 its reverse (212022122212122), we get a palindrome (433234343432334).

The spelling of 221212221220212 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twelve".