2121790659 has 8 divisors (see below), whose sum is σ = 2849407680. Its totient is φ = 1404350376.

The previous prime is 2121790637. The next prime is 2121790661. The reversal of 2121790659 is 9560971212.

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

It is not a de Polignac number, because 2121790659 - 2²⁰ = 2120742083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121790659.

It is not an unprimeable number, because it can be changed into a prime (2121790609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543697 + ... + 2544530.

It is an arithmetic number, because the mean of its divisors is an integer number (356175960).

Almost surely, 2^2121790659 is an apocalyptic number.

2121790659 is a deficient number, since it is larger than the sum of its proper divisors (727617021).

2121790659 is a wasteful number, since it uses less digits than its factorization.

2121790659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088369.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 2121790659 is about 46062.8989426415. The cubic root of 2121790659 is about 1284.9932441721.

The spelling of 2121790659 in words is "two billion, one hundred twenty-one million, seven hundred ninety thousand, six hundred fifty-nine".