2101203109 has 2 divisors, whose sum is σ = 2101203110. Its totient is φ = 2101203108.

The previous prime is 2101203067. The next prime is 2101203119. The reversal of 2101203109 is 9013021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1979983009 + 121220100 = 44497^2 + 11010^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101203109 - 2⁷ = 2101202981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101203119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050601554 + 1050601555.

It is an arithmetic number, because the mean of its divisors is an integer number (1050601555).

Almost surely, 2^2101203109 is an apocalyptic number.

It is an amenable number.

2101203109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101203109 is an equidigital number, since it uses as much as digits as its factorization.

2101203109 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 19.

The square root of 2101203109 is about 45838.8820653384. The cubic root of 2101203109 is about 1280.8236700970.

The spelling of 2101203109 in words is "two billion, one hundred one million, two hundred three thousand, one hundred nine".