2021232321209 has 2 divisors, whose sum is σ = 2021232321210. Its totient is φ = 2021232321208.

The previous prime is 2021232321187. The next prime is 2021232321233. The reversal of 2021232321209 is 9021232321202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1376391200809 + 644841120400 = 1173197^2 + 803020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021232321209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021232311209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010616160604 + 1010616160605.

It is an arithmetic number, because the mean of its divisors is an integer number (1010616160605).

Almost surely, 2^{2021232321209} is an apocalyptic number.

It is an amenable number.

2021232321209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021232321209 is an equidigital number, since it uses as much as digits as its factorization.

2021232321209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 2021232321209 in words is "two trillion, twenty-one billion, two hundred thirty-two million, three hundred twenty-one thousand, two hundred nine".