10221120000991 has 2 divisors, whose sum is σ = 10221120000992. Its totient is φ = 10221120000990.

The previous prime is 10221120000919. The next prime is 10221120001033. The reversal of 10221120000991 is 19900002112201.

Together with previous prime (10221120000919) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10221120000991 - 2⁹ = 10221120000479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10221120000191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110560000495 + 5110560000496.

It is an arithmetic number, because the mean of its divisors is an integer number (5110560000496).

Almost surely, 2^{10221120000991} is an apocalyptic number.

10221120000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221120000991 is an equidigital number, since it uses as much as digits as its factorization.

10221120000991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 10221120000991 in words is "ten trillion, two hundred twenty-one billion, one hundred twenty million, nine hundred ninety-one", and thus it is an aban number.