21170544136 has 32 divisors (see below), whose sum is σ = 45371263680. Its totient is φ = 9071928000.

The previous prime is 21170544133. The next prime is 21170544169. The reversal of 21170544136 is 63144507112.

It is not an unprimeable number, because it can be changed into a prime (21170544133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 528411 + ... + 567061.

It is an arithmetic number, because the mean of its divisors is an integer number (1417851990).

Almost surely, 2^21170544136 is an apocalyptic number.

It is an amenable number.

21170544136 is an abundant number, since it is smaller than the sum of its proper divisors (24200719544).

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

21170544136 is a wasteful number, since it uses less digits than its factorization.

21170544136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48445 (or 48441 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21170544136 in words is "twenty-one billion, one hundred seventy million, five hundred forty-four thousand, one hundred thirty-six".