21101104309 has 2 divisors, whose sum is σ = 21101104310. Its totient is φ = 21101104308.

The previous prime is 21101104301. The next prime is 21101104313. The reversal of 21101104309 is 90340110112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20964144100 + 136960209 = 144790^2 + 11703^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101104309 - 2³ = 21101104301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21101104309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101104301) 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, 10550552154 + 10550552155.

It is an arithmetic number, because the mean of its divisors is an integer number (10550552155).

Almost surely, 2^21101104309 is an apocalyptic number.

It is an amenable number.

21101104309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101104309 is an equidigital number, since it uses as much as digits as its factorization.

21101104309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21101104309 in words is "twenty-one billion, one hundred one million, one hundred four thousand, three hundred nine".