2123516869 has 8 divisors (see below), whose sum is σ = 2255107608. Its totient is φ = 1992668160.

The previous prime is 2123516867. The next prime is 2123516881. The reversal of 2123516869 is 9686153212.

It can be written as a sum of positive squares in 4 ways, for example, as 1809025 + 2121707844 = 1345^2 + 46062^2 .

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 2123516869 - 2¹ = 2123516867 is a prime.

It is a super-2 number, since 2×2123516869² = 9018647785855126322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123516867) 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, 179602 + ... + 191059.

It is an arithmetic number, because the mean of its divisors is an integer number (281888451).

Almost surely, 2^2123516869 is an apocalyptic number.

It is an amenable number.

2123516869 is a deficient number, since it is larger than the sum of its proper divisors (131590739).

2123516869 is a wasteful number, since it uses less digits than its factorization.

2123516869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371015.

The product of its digits is 155520, while the sum is 43.

The square root of 2123516869 is about 46081.6326642188. The cubic root of 2123516869 is about 1285.3416239569.

The spelling of 2123516869 in words is "two billion, one hundred twenty-three million, five hundred sixteen thousand, eight hundred sixty-nine".