20101002209 has 2 divisors, whose sum is σ = 20101002210. Its totient is φ = 20101002208.

The previous prime is 20101002169. The next prime is 20101002217. The reversal of 20101002209 is 90220010102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12476219809 + 7624782400 = 111697^2 + 87320^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101002209 - 2¹⁶ = 20100936673 is a prime.

It is not a weakly prime, because it can be changed into another prime (20101002239) 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, 10050501104 + 10050501105.

It is an arithmetic number, because the mean of its divisors is an integer number (10050501105).

Almost surely, 2^20101002209 is an apocalyptic number.

It is an amenable number.

20101002209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101002209 is an equidigital number, since it uses as much as digits as its factorization.

20101002209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20101002209 in words is "twenty billion, one hundred one million, two thousand, two hundred nine".