2120289721 has 8 divisors (see below), whose sum is σ = 2313383904. Its totient is φ = 1927252320.

The previous prime is 2120289713. The next prime is 2120289761. The reversal of 2120289721 is 1279820212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2120289721 - 2³ = 2120289713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120289761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115266 + ... + 132388.

It is an arithmetic number, because the mean of its divisors is an integer number (289172988).

Almost surely, 2^2120289721 is an apocalyptic number.

It is an amenable number.

2120289721 is a deficient number, since it is larger than the sum of its proper divisors (193094183).

2120289721 is a wasteful number, since it uses less digits than its factorization.

2120289721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28391.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 2120289721 is about 46046.6037944168. The cubic root of 2120289721 is about 1284.6901746646.

The spelling of 2120289721 in words is "two billion, one hundred twenty million, two hundred eighty-nine thousand, seven hundred twenty-one".