21181128076 has 72 divisors (see below), whose sum is σ = 40358062080. Its totient is φ = 9707369760.

The previous prime is 21181128041. The next prime is 21181128091. The reversal of 21181128076 is 67082118112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9458965 + ... + 9461203.

It is an arithmetic number, because the mean of its divisors is an integer number (560528640).

Almost surely, 2^21181128076 is an apocalyptic number.

It is an amenable number.

21181128076 is a deficient number, since it is larger than the sum of its proper divisors (19176934004).

21181128076 is a wasteful number, since it uses less digits than its factorization.

21181128076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435 (or 2402 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 37.

The spelling of 21181128076 in words is "twenty-one billion, one hundred eighty-one million, one hundred twenty-eight thousand, seventy-six".