10221010011991 has 2 divisors, whose sum is σ = 10221010011992. Its totient is φ = 10221010011990.

The previous prime is 10221010011967. The next prime is 10221010012009. The reversal of 10221010011991 is 19911001012201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10221010011991 - 2⁴¹ = 8021986756439 is a prime.

It is a super-3 number, since 3×10221010011991³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10221010011691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110505005995 + 5110505005996.

It is an arithmetic number, because the mean of its divisors is an integer number (5110505005996).

Almost surely, 2^{10221010011991} is an apocalyptic number.

10221010011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221010011991 is an equidigital number, since it uses as much as digits as its factorization.

10221010011991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 10221010011991 in words is "ten trillion, two hundred twenty-one billion, ten million, eleven thousand, nine hundred ninety-one".