21085281450 has 48 divisors (see below), whose sum is σ = 58101668160. Its totient is φ = 5622741360.

The previous prime is 21085281419. The next prime is 21085281467. The reversal of 21085281450 is 5418258012.

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 23 ways as a sum of consecutive naturals, for example, 7808014 + ... + 7810713.

It is an arithmetic number, because the mean of its divisors is an integer number (1210451420).

Almost surely, 2^21085281450 is an apocalyptic number.

21085281450 is an abundant number, since it is smaller than the sum of its proper divisors (37016386710).

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

21085281450 is a wasteful number, since it uses less digits than its factorization.

21085281450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15618748 (or 15618737 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The spelling of 21085281450 in words is "twenty-one billion, eighty-five million, two hundred eighty-one thousand, four hundred fifty".