21444411440 has 40 divisors (see below), whose sum is σ = 50081877888. Its totient is φ = 8539292160.

The previous prime is 21444411377. The next prime is 21444411463. The reversal of 21444411440 is 4411444412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583181 + ... + 618860.

Almost surely, 2^21444411440 is an apocalyptic number.

21444411440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444411440 is an abundant number, since it is smaller than the sum of its proper divisors (28637466448).

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

21444411440 is a wasteful number, since it uses less digits than its factorization.

21444411440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202277 (or 1202271 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 21444411440 its reverse (4411444412), we get a palindrome (25855855852).

The spelling of 21444411440 in words is "twenty-one billion, four hundred forty-four million, four hundred eleven thousand, four hundred forty".