221221012220201 has 4 divisors (see below), whose sum is σ = 252824013965952. Its totient is φ = 189618010474452.

The previous prime is 221221012220179. The next prime is 221221012220237. The reversal of 221221012220201 is 102022210122122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221221012220201 - 2⁶ = 221221012220137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221012220801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15801500872865 + ... + 15801500872878.

It is an arithmetic number, because the mean of its divisors is an integer number (63206003491488).

Almost surely, 2^{221221012220201} is an apocalyptic number.

It is an amenable number.

221221012220201 is a deficient number, since it is larger than the sum of its proper divisors (31603001745751).

221221012220201 is an equidigital number, since it uses as much as digits as its factorization.

221221012220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31603001745750.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221221012220201 its reverse (102022210122122), we get a palindrome (323243222342323).

The spelling of 221221012220201 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, twelve million, two hundred twenty thousand, two hundred one".