2100203009 has 2 divisors, whose sum is σ = 2100203010. Its totient is φ = 2100203008.

The previous prime is 2100202987. The next prime is 2100203023. The reversal of 2100203009 is 9003020012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1608250609 + 491952400 = 40103^2 + 22180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100203009 - 2¹² = 2100198913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100293009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050101504 + 1050101505.

It is an arithmetic number, because the mean of its divisors is an integer number (1050101505).

Almost surely, 2^2100203009 is an apocalyptic number.

It is an amenable number.

2100203009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100203009 is an equidigital number, since it uses as much as digits as its factorization.

2100203009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2100203009 is about 45827.9719058132. The cubic root of 2100203009 is about 1280.6204285937.

The spelling of 2100203009 in words is "two billion, one hundred million, two hundred three thousand, nine".