122643710721 has 24 divisors (see below), whose sum is σ = 202470637824. Its totient is φ = 70078250880.

The previous prime is 122643710687. The next prime is 122643710729. The reversal of 122643710721 is 127017346221.

122643710721 is a `hidden beast` number, since 1 + 2 + 2 + 643 + 7 + 1 + 0 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 122643710721 - 2⁷ = 122643710593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122643710729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1410376 + ... + 1494806.

It is an arithmetic number, because the mean of its divisors is an integer number (8436276576).

Almost surely, 2^122643710721 is an apocalyptic number.

It is an amenable number.

122643710721 is a deficient number, since it is larger than the sum of its proper divisors (79826927103).

122643710721 is a wasteful number, since it uses less digits than its factorization.

122643710721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107501 (or 107498 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 122643710721 in words is "one hundred twenty-two billion, six hundred forty-three million, seven hundred ten thousand, seven hundred twenty-one".