21100012249 has 2 divisors, whose sum is σ = 21100012250. Its totient is φ = 21100012248.

The previous prime is 21100012189. The next prime is 21100012253. The reversal of 21100012249 is 94221000112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14203872400 + 6896139849 = 119180^2 + 83043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100012249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100012279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550006124 + 10550006125.

It is an arithmetic number, because the mean of its divisors is an integer number (10550006125).

Almost surely, 2^21100012249 is an apocalyptic number.

It is an amenable number.

21100012249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100012249 is an equidigital number, since it uses as much as digits as its factorization.

21100012249 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 22.

The spelling of 21100012249 in words is "twenty-one billion, one hundred million, twelve thousand, two hundred forty-nine".