21582775350 has 96 divisors (see below), whose sum is σ = 59559060000. Its totient is φ = 5747034240.

The previous prime is 21582775349. The next prime is 21582775363. The reversal of 21582775350 is 5357728512.

21582775350 is a `hidden beast` number, since 21 + 5 + 8 + 277 + 5 + 350 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21582775296 and 21582775305.

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, 945876 + ... + 968424.

It is an arithmetic number, because the mean of its divisors is an integer number (620406875).

Almost surely, 2^21582775350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21582775350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29779530000).

21582775350 is an abundant number, since it is smaller than the sum of its proper divisors (37976284650).

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

21582775350 is a wasteful number, since it uses less digits than its factorization.

21582775350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23279 (or 23268 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 45.

The spelling of 21582775350 in words is "twenty-one billion, five hundred eighty-two million, seven hundred seventy-five thousand, three hundred fifty".