21116550576 has 80 divisors (see below), whose sum is σ = 60227395200. Its totient is φ = 6321845760.

The previous prime is 21116550569. The next prime is 21116550589. The reversal of 21116550576 is 67505561112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197101 + ... + 284748.

It is an arithmetic number, because the mean of its divisors is an integer number (752842440).

Almost surely, 2^21116550576 is an apocalyptic number.

It is an amenable number.

21116550576 is an abundant number, since it is smaller than the sum of its proper divisors (39110844624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21116550576 is a wasteful number, since it uses less digits than its factorization.

21116550576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481954 (or 481948 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 21116550576 in words is "twenty-one billion, one hundred sixteen million, five hundred fifty thousand, five hundred seventy-six".