221212021201212 has 24 divisors (see below), whose sum is σ = 532811749990912. Its totient is φ = 71358716516400.

The previous prime is 221212021201201. The next prime is 221212021201217. The reversal of 221212021201212 is 212102120212122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212021201217) 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, 297327985114 + ... + 297327985857.

Almost surely, 2^{221212021201212} is an apocalyptic number.

It is an amenable number.

221212021201212 is an abundant number, since it is smaller than the sum of its proper divisors (311599728789700).

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

221212021201212 is a wasteful number, since it uses less digits than its factorization.

221212021201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594655971009 (or 594655971007 counting only the distinct ones).

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

Adding to 221212021201212 its reverse (212102120212122), we get a palindrome (433314141413334).

The spelling of 221212021201212 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, two hundred one thousand, two hundred twelve".