21444133420 has 12 divisors (see below), whose sum is σ = 45032680224. Its totient is φ = 8577653360.

The previous prime is 21444133397. The next prime is 21444133441. The reversal of 21444133420 is 2433144412.

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 3 ways as a sum of consecutive naturals, for example, 536103316 + ... + 536103355.

It is an arithmetic number, because the mean of its divisors is an integer number (3752723352).

Almost surely, 2^21444133420 is an apocalyptic number.

21444133420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444133420 is an abundant number, since it is smaller than the sum of its proper divisors (23588546804).

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

21444133420 is a wasteful number, since it uses less digits than its factorization.

21444133420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072206680 (or 1072206678 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21444133420 its reverse (2433144412), we get a palindrome (23877277832).

The spelling of 21444133420 in words is "twenty-one billion, four hundred forty-four million, one hundred thirty-three thousand, four hundred twenty".