2021211122009 has 2 divisors, whose sum is σ = 2021211122010. Its totient is φ = 2021211122008.

The previous prime is 2021211121999. The next prime is 2021211122053. The reversal of 2021211122009 is 9002211121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1094618137600 + 926592984409 = 1046240^2 + 962597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021211122009 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021211122069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010605561004 + 1010605561005.

It is an arithmetic number, because the mean of its divisors is an integer number (1010605561005).

Almost surely, 2^{2021211122009} is an apocalyptic number.

It is an amenable number.

2021211122009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021211122009 is an equidigital number, since it uses as much as digits as its factorization.

2021211122009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 2021211122009 in words is "two trillion, twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, nine".