101001122221991 has 2 divisors, whose sum is σ = 101001122221992. Its totient is φ = 101001122221990.

The previous prime is 101001122221877. The next prime is 101001122222111. The reversal of 101001122221991 is 199122221100101.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101001122221991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101001122220991) 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, 50500561110995 + 50500561110996.

It is an arithmetic number, because the mean of its divisors is an integer number (50500561110996).

Almost surely, 2^{101001122221991} is an apocalyptic number.

101001122221991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101001122221991 is an equidigital number, since it uses as much as digits as its factorization.

101001122221991 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 101001122221991 in words is "one hundred one trillion, one billion, one hundred twenty-two million, two hundred twenty-one thousand, nine hundred ninety-one".