21103201110109 has 2 divisors, whose sum is σ = 21103201110110. Its totient is φ = 21103201110108.

The previous prime is 21103201110067. The next prime is 21103201110169. The reversal of 21103201110109 is 90101110230112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15613388098884 + 5489813011225 = 3951378^2 + 2343035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103201110109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21103201110109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103201110169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551600555054 + 10551600555055.

It is an arithmetic number, because the mean of its divisors is an integer number (10551600555055).

Almost surely, 2^{21103201110109} is an apocalyptic number.

It is an amenable number.

21103201110109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103201110109 is an equidigital number, since it uses as much as digits as its factorization.

21103201110109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 22.

The spelling of 21103201110109 in words is "twenty-one trillion, one hundred three billion, two hundred one million, one hundred ten thousand, one hundred nine".