221212221210201 has 32 divisors (see below), whose sum is σ = 319904449659648. Its totient is φ = 135161147347200.

The previous prime is 221212221210181. The next prime is 221212221210203. The reversal of 221212221210201 is 102012122212122.

It is not a de Polignac number, because 221212221210201 - 2⁹ = 221212221209689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221212221210203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13652250 + ... + 25076051.

It is an arithmetic number, because the mean of its divisors is an integer number (9997014051864).

Almost surely, 2^{221212221210201} is an apocalyptic number.

It is an amenable number.

221212221210201 is a deficient number, since it is larger than the sum of its proper divisors (98692228449447).

221212221210201 is a wasteful number, since it uses less digits than its factorization.

221212221210201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38729361.

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

Adding to 221212221210201 its reverse (102012122212122), we get a palindrome (323224343422323).

The spelling of 221212221210201 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, two hundred one".