20121211120221 has 12 divisors (see below), whose sum is σ = 29064788553372. Its totient is φ = 13413763699776.

The previous prime is 20121211120207. The next prime is 20121211120243. The reversal of 20121211120221 is 12202111212102.

20121211120221 is a `hidden beast` number, since 201 + 2 + 121 + 1 + 120 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8252324854596 + 11868886265625 = 2872686^2 + 3445125^2 .

It is not a de Polignac number, because 20121211120221 - 2¹³ = 20121211112029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20121211120194 and 20121211120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121211120271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31082416 + ... + 31723161.

It is an arithmetic number, because the mean of its divisors is an integer number (2422065712781).

Almost surely, 2^{20121211120221} is an apocalyptic number.

It is an amenable number.

20121211120221 is a deficient number, since it is larger than the sum of its proper divisors (8943577433151).

20121211120221 is a wasteful number, since it uses less digits than its factorization.

20121211120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62841180 (or 62841177 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20121211120221 its reverse (12202111212102), we get a palindrome (32323322332323).

The spelling of 20121211120221 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, one hundred twenty thousand, two hundred twenty-one".