221221221120201 has 16 divisors (see below), whose sum is σ = 295163193588480. Its totient is φ = 147380033171280.

The previous prime is 221221221120191. The next prime is 221221221120209. The reversal of 221221221120201 is 102021122122122.

It is not a de Polignac number, because 221221221120201 - 2¹¹ = 221221221118153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221221120209) 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, 869825866 + ... + 870080156.

It is an arithmetic number, because the mean of its divisors is an integer number (18447699599280).

Almost surely, 2^{221221221120201} is an apocalyptic number.

It is an amenable number.

221221221120201 is a deficient number, since it is larger than the sum of its proper divisors (73941972468279).

221221221120201 is a wasteful number, since it uses less digits than its factorization.

221221221120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451316.

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

Adding to 221221221120201 its reverse (102021122122122), we get a palindrome (323242343242323).

The spelling of 221221221120201 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, two hundred one".