201221401291 has 2 divisors, whose sum is σ = 201221401292. Its totient is φ = 201221401290.

The previous prime is 201221401259. The next prime is 201221401321. The reversal of 201221401291 is 192104122102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221401291 - 2⁵ = 201221401259 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221401231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610700645 + 100610700646.

It is an arithmetic number, because the mean of its divisors is an integer number (100610700646).

Almost surely, 2^201221401291 is an apocalyptic number.

201221401291 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221401291 is an equidigital number, since it uses as much as digits as its factorization.

201221401291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 201221401291 its reverse (192104122102), we get a palindrome (393325523393).

The spelling of 201221401291 in words is "two hundred one billion, two hundred twenty-one million, four hundred one thousand, two hundred ninety-one".