101221221100991 has 2 divisors, whose sum is σ = 101221221100992. Its totient is φ = 101221221100990.

The previous prime is 101221221100963. The next prime is 101221221101069. The reversal of 101221221100991 is 199001122122101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101221221100991 - 2⁶ = 101221221100927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101221221120991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610610550495 + 50610610550496.

It is an arithmetic number, because the mean of its divisors is an integer number (50610610550496).

Almost surely, 2^{101221221100991} is an apocalyptic number.

101221221100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221221100991 is an equidigital number, since it uses as much as digits as its factorization.

101221221100991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 101221221100991 in words is "one hundred one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, nine hundred ninety-one".