2100005199991 has 2 divisors, whose sum is σ = 2100005199992. Its totient is φ = 2100005199990.

The previous prime is 2100005199961. The next prime is 2100005200049. The reversal of 2100005199991 is 1999915000012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2100005199991 - 2⁵ = 2100005199959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100005199961) 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, 1050002599995 + 1050002599996.

It is an arithmetic number, because the mean of its divisors is an integer number (1050002599996).

Almost surely, 2^{2100005199991} is an apocalyptic number.

2100005199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100005199991 is an equidigital number, since it uses as much as digits as its factorization.

2100005199991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 46.

The spelling of 2100005199991 in words is "two trillion, one hundred billion, five million, one hundred ninety-nine thousand, nine hundred ninety-one".