221331211201 has 4 divisors (see below), whose sum is σ = 221332179712. Its totient is φ = 221330242692.

The previous prime is 221331211177. The next prime is 221331211237. The reversal of 221331211201 is 102112133122.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221331211201 - 2⁵ = 221331211169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221331211271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69976 + ... + 668998.

It is an arithmetic number, because the mean of its divisors is an integer number (55333044928).

Almost surely, 2^221331211201 is an apocalyptic number.

It is an amenable number.

221331211201 is a deficient number, since it is larger than the sum of its proper divisors (968511).

221331211201 is an equidigital number, since it uses as much as digits as its factorization.

221331211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968510.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221331211201 its reverse (102112133122), we get a palindrome (323443344323).

The spelling of 221331211201 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, two hundred one".