2101002120209 has 2 divisors, whose sum is σ = 2101002120210. Its totient is φ = 2101002120208.

The previous prime is 2101002120179. The next prime is 2101002120229. The reversal of 2101002120209 is 9020212001012.

It is a happy number.

It is an a-pointer prime, because the next prime (2101002120229) can be obtained adding 2101002120209 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1298795284609 + 802206835600 = 1139647^2 + 895660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101002120209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101002120229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050501060104 + 1050501060105.

It is an arithmetic number, because the mean of its divisors is an integer number (1050501060105).

Almost surely, 2^{2101002120209} is an apocalyptic number.

It is an amenable number.

2101002120209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101002120209 is an equidigital number, since it uses as much as digits as its factorization.

2101002120209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 2101002120209 in words is "two trillion, one hundred one billion, two million, one hundred twenty thousand, two hundred nine".