2123385681 has 8 divisors (see below), whose sum is σ = 2852793504. Its totient is φ = 1404784160.

The previous prime is 2123385653. The next prime is 2123385683. The reversal of 2123385681 is 1865833212.

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 2123385681 - 2¹⁰ = 2123384657 is a prime.

It is a super-2 number, since 2×2123385681² = 9017533500551667522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2123385683) 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, 2701116 + ... + 2701901.

It is an arithmetic number, because the mean of its divisors is an integer number (356599188).

Almost surely, 2^2123385681 is an apocalyptic number.

It is an amenable number.

2123385681 is a deficient number, since it is larger than the sum of its proper divisors (729407823).

2123385681 is a wasteful number, since it uses less digits than its factorization.

2123385681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403151.

The product of its digits is 69120, while the sum is 39.

The square root of 2123385681 is about 46080.2092117647. The cubic root of 2123385681 is about 1285.3151545228.

The spelling of 2123385681 in words is "two billion, one hundred twenty-three million, three hundred eighty-five thousand, six hundred eighty-one".