101222221391 has 2 divisors, whose sum is σ = 101222221392. Its totient is φ = 101222221390.

The previous prime is 101222221379. The next prime is 101222221447. The reversal of 101222221391 is 193122222101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101222221391 - 2¹⁰ = 101222220367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101222221391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101222221361) 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 as a sum of consecutive naturals, namely, 50611110695 + 50611110696.

It is an arithmetic number, because the mean of its divisors is an integer number (50611110696).

Almost surely, 2^101222221391 is an apocalyptic number.

101222221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

101222221391 is an equidigital number, since it uses as much as digits as its factorization.

101222221391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 101222221391 its reverse (193122222101), we get a palindrome (294344443492).

The spelling of 101222221391 in words is "one hundred one billion, two hundred twenty-two million, two hundred twenty-one thousand, three hundred ninety-one".