21754808838 has 96 divisors (see below), whose sum is σ = 55898069760. Its totient is φ = 5982863040.

The previous prime is 21754808827. The next prime is 21754808843. The reversal of 21754808838 is 83880845712.

21754808838 is a `hidden beast` number, since 2 + 17 + 548 + 0 + 8 + 83 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1200481 + ... + 1218467.

It is an arithmetic number, because the mean of its divisors is an integer number (582271560).

Almost surely, 2^21754808838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21754808838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27949034880).

21754808838 is an abundant number, since it is smaller than the sum of its proper divisors (34143260922).

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

21754808838 is a wasteful number, since it uses less digits than its factorization.

21754808838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18362 (or 18359 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 21754808838 in words is "twenty-one billion, seven hundred fifty-four million, eight hundred eight thousand, eight hundred thirty-eight".