20121122201221 has 16 divisors (see below), whose sum is σ = 20730658088448. Its totient is φ = 19518474150000.

The previous prime is 20121122201153. The next prime is 20121122201227. The reversal of 20121122201221 is 12210222112102.

It is a cyclic number.

It is not a de Polignac number, because 20121122201221 - 2¹¹ = 20121122199173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121122201227) 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, 1058896 + ... + 6431446.

It is an arithmetic number, because the mean of its divisors is an integer number (1295666130528).

Almost surely, 2^{20121122201221} is an apocalyptic number.

It is an amenable number.

20121122201221 is a deficient number, since it is larger than the sum of its proper divisors (609535887227).

20121122201221 is a wasteful number, since it uses less digits than its factorization.

20121122201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5373192.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20121122201221 its reverse (12210222112102), we get a palindrome (32331344313323).

The spelling of 20121122201221 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred one thousand, two hundred twenty-one".