2012021221221 has 24 divisors (see below), whose sum is σ = 3191735944800. Its totient is φ = 1211222853600.

The previous prime is 2012021221207. The next prime is 2012021221237. The reversal of 2012021221221 is 1221221202102.

It is a happy number.

2012021221221 is a `hidden beast` number, since 20 + 1 + 202 + 1 + 221 + 221 = 666.

It is not a de Polignac number, because 2012021221221 - 2⁹ = 2012021220709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012021221194 and 2012021221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012021221241) 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, 68184735 + ... + 68214236.

It is an arithmetic number, because the mean of its divisors is an integer number (132988997700).

Almost surely, 2^{2012021221221} is an apocalyptic number.

It is an amenable number.

2012021221221 is a deficient number, since it is larger than the sum of its proper divisors (1179714723579).

2012021221221 is a wasteful number, since it uses less digits than its factorization.

2012021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136399137 (or 136399134 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2012021221221 its reverse (1221221202102), we get a palindrome (3233242423323).

The spelling of 2012021221221 in words is "two trillion, twelve billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".