2123220409 has 2 divisors, whose sum is σ = 2123220410. Its totient is φ = 2123220408.

The previous prime is 2123220391. The next prime is 2123220461. The reversal of 2123220409 is 9040223212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1934240400 + 188980009 = 43980^2 + 13747^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123220409 - 2⁵ = 2123220377 is a prime.

It is not a weakly prime, because it can be changed into another prime (2123220499) 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, 1061610204 + 1061610205.

It is an arithmetic number, because the mean of its divisors is an integer number (1061610205).

Almost surely, 2^2123220409 is an apocalyptic number.

It is an amenable number.

2123220409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123220409 is an equidigital number, since it uses as much as digits as its factorization.

2123220409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2123220409 is about 46078.4158690379. The cubic root of 2123220409 is about 1285.2818065039.

The spelling of 2123220409 in words is "two billion, one hundred twenty-three million, two hundred twenty thousand, four hundred nine".