21450544142304 has 96 divisors (see below), whose sum is σ = 57380587536384. Its totient is φ = 7013988334080.

The previous prime is 21450544142303. The next prime is 21450544142327. The reversal of 21450544142304 is 40324144505412.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450544142303) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27616209 + ... + 28382319.

It is an arithmetic number, because the mean of its divisors is an integer number (597714453504).

Almost surely, 2^{21450544142304} is an apocalyptic number.

21450544142304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21450544142304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28690293768192).

21450544142304 is an abundant number, since it is smaller than the sum of its proper divisors (35930043394080).

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

21450544142304 is a wasteful number, since it uses less digits than its factorization.

21450544142304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771680 (or 771672 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 39.

Adding to 21450544142304 its reverse (40324144505412), we get a palindrome (61774688647716).

The spelling of 21450544142304 in words is "twenty-one trillion, four hundred fifty billion, five hundred forty-four million, one hundred forty-two thousand, three hundred four".