21758855132 has 36 divisors (see below), whose sum is σ = 44310258720. Its totient is φ = 9321971904.

The previous prime is 21758855099. The next prime is 21758855137. The reversal of 21758855132 is 23155885712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21758855137) 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 11 ways as a sum of consecutive naturals, for example, 593528 + ... + 629120.

It is an arithmetic number, because the mean of its divisors is an integer number (1230840520).

Almost surely, 2^21758855132 is an apocalyptic number.

It is an amenable number.

21758855132 is an abundant number, since it is smaller than the sum of its proper divisors (22551403588).

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

21758855132 is a wasteful number, since it uses less digits than its factorization.

21758855132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38730 (or 38721 counting only the distinct ones).

The product of its digits is 672000, while the sum is 47.

The spelling of 21758855132 in words is "twenty-one billion, seven hundred fifty-eight million, eight hundred fifty-five thousand, one hundred thirty-two".