201101220391 has 2 divisors, whose sum is σ = 201101220392. Its totient is φ = 201101220390.

The previous prime is 201101220283. The next prime is 201101220409. The reversal of 201101220391 is 193022101102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201101220391 - 2¹¹ = 201101218343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201101220491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100550610195 + 100550610196.

It is an arithmetic number, because the mean of its divisors is an integer number (100550610196).

Almost surely, 2^201101220391 is an apocalyptic number.

201101220391 is a deficient number, since it is larger than the sum of its proper divisors (1).

201101220391 is an equidigital number, since it uses as much as digits as its factorization.

201101220391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 201101220391 its reverse (193022101102), we get a palindrome (394123321493).

The spelling of 201101220391 in words is "two hundred one billion, one hundred one million, two hundred twenty thousand, three hundred ninety-one".