10202121100991 has 2 divisors, whose sum is σ = 10202121100992. Its totient is φ = 10202121100990.

The previous prime is 10202121100979. The next prime is 10202121101069. The reversal of 10202121100991 is 19900112120201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202121100991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10202121160991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101060550495 + 5101060550496.

It is an arithmetic number, because the mean of its divisors is an integer number (5101060550496).

Almost surely, 2^{10202121100991} is an apocalyptic number.

10202121100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10202121100991 is an equidigital number, since it uses as much as digits as its factorization.

10202121100991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 10202121100991 in words is "ten trillion, two hundred two billion, one hundred twenty-one million, one hundred thousand, nine hundred ninety-one".