21444521450 has 36 divisors (see below), whose sum is σ = 43842538950. Its totient is φ = 7798005600.

The previous prime is 21444521401. The next prime is 21444521473. The reversal of 21444521450 is 5412544412.

It can be written as a sum of positive squares in 3 ways, for example, as 19482297241 + 1962224209 = 139579^2 + 44297^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1766225 + ... + 1778324.

Almost surely, 2^21444521450 is an apocalyptic number.

21444521450 is an abundant number, since it is smaller than the sum of its proper divisors (22398017500).

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

21444521450 is a wasteful number, since it uses less digits than its factorization.

21444521450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544583 (or 3544567 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 32.

The spelling of 21444521450 in words is "twenty-one billion, four hundred forty-four million, five hundred twenty-one thousand, four hundred fifty".