2120221601609 has 16 divisors (see below), whose sum is σ = 2273216762880. Its totient is φ = 1971616162320.

The previous prime is 2120221601581. The next prime is 2120221601651. The reversal of 2120221601609 is 9061061220212.

It is a cyclic number.

It is not a de Polignac number, because 2120221601609 - 2⁸ = 2120221601353 is a prime.

It is a super-2 number, since 2×2120221601609² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2120221601669) 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 15 ways as a sum of consecutive naturals, for example, 3155669 + ... + 3768114.

It is an arithmetic number, because the mean of its divisors is an integer number (142076047680).

Almost surely, 2^{2120221601609} is an apocalyptic number.

It is an amenable number.

2120221601609 is a deficient number, since it is larger than the sum of its proper divisors (152995161271).

2120221601609 is a wasteful number, since it uses less digits than its factorization.

2120221601609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924100.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 2120221601609 in words is "two trillion, one hundred twenty billion, two hundred twenty-one million, six hundred one thousand, six hundred nine".