101221022191 has 2 divisors, whose sum is σ = 101221022192. Its totient is φ = 101221022190.

The previous prime is 101221022173. The next prime is 101221022263. The reversal of 101221022191 is 191220122101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101221022191 - 2¹⁷ = 101220891119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101221002191) 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 as a sum of consecutive naturals, namely, 50610511095 + 50610511096.

It is an arithmetic number, because the mean of its divisors is an integer number (50610511096).

Almost surely, 2^101221022191 is an apocalyptic number.

101221022191 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221022191 is an equidigital number, since it uses as much as digits as its factorization.

101221022191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 101221022191 its reverse (191220122101), we get a palindrome (292441144292).

The spelling of 101221022191 in words is "one hundred one billion, two hundred twenty-one million, twenty-two thousand, one hundred ninety-one".