1012212201221 has 24 divisors (see below), whose sum is σ = 1132743179520. Its totient is φ = 903152764800.

The previous prime is 1012212201157. The next prime is 1012212201227. The reversal of 1012212201221 is 1221022122101.

It is not a de Polignac number, because 1012212201221 - 2⁶ = 1012212201157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012212201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012212201227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4387841 + ... + 4612761.

It is an arithmetic number, because the mean of its divisors is an integer number (47197632480).

Almost surely, 2^{1012212201221} is an apocalyptic number.

It is an amenable number.

1012212201221 is a deficient number, since it is larger than the sum of its proper divisors (120530978299).

1012212201221 is a wasteful number, since it uses less digits than its factorization.

1012212201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225837 (or 225824 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1012212201221 its reverse (1221022122101), we get a palindrome (2233234323322).

The spelling of 1012212201221 in words is "one trillion, twelve billion, two hundred twelve million, two hundred one thousand, two hundred twenty-one".