2120444221409 has 4 divisors (see below), whose sum is σ = 2120479600404. Its totient is φ = 2120408842416.

The previous prime is 2120444221351. The next prime is 2120444221411. The reversal of 2120444221409 is 9041224440212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 867170688400 + 1253273533009 = 931220^2 + 1119497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120444221409 is a prime.

It is a super-2 number, since 2×2120444221409² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120444221009) 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 in 3 ways as a sum of consecutive naturals, for example, 17599442 + ... + 17719515.

It is an arithmetic number, because the mean of its divisors is an integer number (530119900101).

Almost surely, 2^{2120444221409} is an apocalyptic number.

It is an amenable number.

2120444221409 is a deficient number, since it is larger than the sum of its proper divisors (35378995).

2120444221409 is an equidigital number, since it uses as much as digits as its factorization.

2120444221409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35378994.

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 2120444221409 in words is "two trillion, one hundred twenty billion, four hundred forty-four million, two hundred twenty-one thousand, four hundred nine".