21282518390 has 24 divisors (see below), whose sum is σ = 44562988512. Its totient is φ = 7296863280.

The previous prime is 21282518371. The next prime is 21282518417. The reversal of 21282518390 is 9381528212.

It is a congruent number.

It is an unprimeable number.

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, 21716366 + ... + 21717345.

It is an arithmetic number, because the mean of its divisors is an integer number (1856791188).

Almost surely, 2^21282518390 is an apocalyptic number.

21282518390 is an abundant number, since it is smaller than the sum of its proper divisors (23280470122).

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

21282518390 is a wasteful number, since it uses less digits than its factorization.

21282518390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43433732 (or 43433725 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 21282518390 in words is "twenty-one billion, two hundred eighty-two million, five hundred eighteen thousand, three hundred ninety".