21100110049 has 2 divisors, whose sum is σ = 21100110050. Its totient is φ = 21100110048.

The previous prime is 21100110013. The next prime is 21100110077. The reversal of 21100110049 is 94001100112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21090300625 + 9809424 = 145225^2 + 3132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100110049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100111049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550055024 + 10550055025.

It is an arithmetic number, because the mean of its divisors is an integer number (10550055025).

Almost surely, 2^21100110049 is an apocalyptic number.

It is an amenable number.

21100110049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100110049 is an equidigital number, since it uses as much as digits as its factorization.

21100110049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21100110049 in words is "twenty-one billion, one hundred million, one hundred ten thousand, forty-nine".