221012021221212 has 48 divisors (see below), whose sum is σ = 555459179692032. Its totient is φ = 67991987916480.

The previous prime is 221012021221207. The next prime is 221012021221219. The reversal of 221012021221212 is 212122120210122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012021221219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121079964 + ... + 122891747.

It is an arithmetic number, because the mean of its divisors is an integer number (11572066243584).

Almost surely, 2^{221012021221212} is an apocalyptic number.

It is an amenable number.

221012021221212 is an abundant number, since it is smaller than the sum of its proper divisors (334447158470820).

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

221012021221212 is a wasteful number, since it uses less digits than its factorization.

221012021221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243977538 (or 243977536 counting only the distinct ones).

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

Adding to 221012021221212 its reverse (212122120210122), we get a palindrome (433134141431334).

The spelling of 221012021221212 in words is "two hundred twenty-one trillion, twelve billion, twenty-one million, two hundred twenty-one thousand, two hundred twelve".