21201100010191 has 2 divisors, whose sum is σ = 21201100010192. Its totient is φ = 21201100010190.

The previous prime is 21201100010117. The next prime is 21201100010227. The reversal of 21201100010191 is 19101000110212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201100010191 - 2³³ = 21192510075599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201100010491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600550005095 + 10600550005096.

It is an arithmetic number, because the mean of its divisors is an integer number (10600550005096).

Almost surely, 2^{21201100010191} is an apocalyptic number.

21201100010191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201100010191 is an equidigital number, since it uses as much as digits as its factorization.

21201100010191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 21201100010191 in words is "twenty-one trillion, two hundred one billion, one hundred million, ten thousand, one hundred ninety-one".