221211133201 has 2 divisors, whose sum is σ = 221211133202. Its totient is φ = 221211133200.

The previous prime is 221211133189. The next prime is 221211133207. The reversal of 221211133201 is 102331112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151166217601 + 70044915600 = 388801^2 + 264660^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211133201 - 2²³ = 221202744593 is a prime.

It is not a weakly prime, because it can be changed into another prime (221211133207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605566600 + 110605566601.

It is an arithmetic number, because the mean of its divisors is an integer number (110605566601).

Almost surely, 2^221211133201 is an apocalyptic number.

It is an amenable number.

221211133201 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211133201 is an equidigital number, since it uses as much as digits as its factorization.

221211133201 is an evil number, because the sum of its binary digits is even.

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

Adding to 221211133201 its reverse (102331112122), we get a palindrome (323542245323).

The spelling of 221211133201 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred thirty-three thousand, two hundred one".