21812582550 has 48 divisors (see below), whose sum is σ = 59012955072. Its totient is φ = 5287898400.

The previous prime is 21812582531. The next prime is 21812582563. The reversal of 21812582550 is 5528521812.

It is a junction number, because it is equal to n+sod(n) for n = 21812582499 and 21812582508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6608224 + ... + 6611523.

It is an arithmetic number, because the mean of its divisors is an integer number (1229436564).

Almost surely, 2^21812582550 is an apocalyptic number.

21812582550 is an abundant number, since it is smaller than the sum of its proper divisors (37200372522).

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

21812582550 is a wasteful number, since it uses less digits than its factorization.

21812582550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13219773 (or 13219768 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 39.

The spelling of 21812582550 in words is "twenty-one billion, eight hundred twelve million, five hundred eighty-two thousand, five hundred fifty".