2123481681 has 12 divisors (see below), whose sum is σ = 3097031808. Its totient is φ = 1401909624.

The previous prime is 2123481673. The next prime is 2123481707. The reversal of 2123481681 is 1861843212.

It is not a de Polignac number, because 2123481681 - 2³ = 2123481673 is a prime.

It is a super-2 number, since 2×2123481681² = 9018348899085171522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2123481631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1144425 + ... + 1146278.

It is an arithmetic number, because the mean of its divisors is an integer number (258085984).

Almost surely, 2^2123481681 is an apocalyptic number.

It is an amenable number.

2123481681 is a deficient number, since it is larger than the sum of its proper divisors (973550127).

2123481681 is a wasteful number, since it uses less digits than its factorization.

2123481681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290812 (or 2290809 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 2123481681 is about 46081.2508619287. The cubic root of 2123481681 is about 1285.3345242801.

The spelling of 2123481681 in words is "two billion, one hundred twenty-three million, four hundred eighty-one thousand, six hundred eighty-one".