21001100122199 has 2 divisors, whose sum is σ = 21001100122200. Its totient is φ = 21001100122198.

The previous prime is 21001100122193. The next prime is 21001100122231. The reversal of 21001100122199 is 99122100110012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001100122199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001100122193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500550061099 + 10500550061100.

It is an arithmetic number, because the mean of its divisors is an integer number (10500550061100).

Almost surely, 2^{21001100122199} is an apocalyptic number.

21001100122199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001100122199 is an equidigital number, since it uses as much as digits as its factorization.

21001100122199 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 21001100122199 in words is "twenty-one trillion, one billion, one hundred million, one hundred twenty-two thousand, one hundred ninety-nine".