221221202101212 has 96 divisors (see below), whose sum is σ = 532622778311680. Its totient is φ = 71437547151360.

The previous prime is 221221202101189. The next prime is 221221202101213. The reversal of 221221202101212 is 212101202122122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221202101213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5074887 + ... + 21637857.

Almost surely, 2^{221221202101212} is an apocalyptic number.

It is an amenable number.

221221202101212 is an abundant number, since it is smaller than the sum of its proper divisors (311401576210468).

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

221221202101212 is a wasteful number, since it uses less digits than its factorization.

221221202101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16563323 (or 16563321 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221221202101212 its reverse (212101202122122), we get a palindrome (433322404223334).

The spelling of 221221202101212 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred one thousand, two hundred twelve".