2120021212009 has 2 divisors, whose sum is σ = 2120021212010. Its totient is φ = 2120021212008.

The previous prime is 2120021211977. The next prime is 2120021212063. The reversal of 2120021212009 is 9002121200212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1617404019984 + 502617192025 = 1271772^2 + 708955^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120021212009 - 2⁵ = 2120021211977 is a prime.

It is not a weakly prime, because it can be changed into another prime (2120021212109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060010606004 + 1060010606005.

It is an arithmetic number, because the mean of its divisors is an integer number (1060010606005).

Almost surely, 2^{2120021212009} is an apocalyptic number.

It is an amenable number.

2120021212009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120021212009 is an equidigital number, since it uses as much as digits as its factorization.

2120021212009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 2120021212009 in words is "two trillion, one hundred twenty billion, twenty-one million, two hundred twelve thousand, nine".