21110210000249 has 2 divisors, whose sum is σ = 21110210000250. Its totient is φ = 21110210000248.

The previous prime is 21110210000179. The next prime is 21110210000273. The reversal of 21110210000249 is 94200001201112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19147319335225 + 1962890665024 = 4375765^2 + 1401032^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110210000249 - 2²⁴ = 21110193223033 is a prime.

It is a super-2 number, since 2×21110210000249² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21110210000849) 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, 10555105000124 + 10555105000125.

It is an arithmetic number, because the mean of its divisors is an integer number (10555105000125).

Almost surely, 2^{21110210000249} is an apocalyptic number.

It is an amenable number.

21110210000249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110210000249 is an equidigital number, since it uses as much as digits as its factorization.

21110210000249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21110210000249 in words is "twenty-one trillion, one hundred ten billion, two hundred ten million, two hundred forty-nine", and thus it is an aban number.