21544523023040 has 224 divisors, whose sum is σ = 52830223999488. Its totient is φ = 8365142016000.

The previous prime is 21544523023021. The next prime is 21544523023091. The reversal of 21544523023040 is 4032032544512.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 5116246535 + ... + 5116250745.

Almost surely, 2^{21544523023040} is an apocalyptic number.

21544523023040 is a gapful number since it is divisible by the number (20) 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 21544523023040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26415111999744).

21544523023040 is an abundant number, since it is smaller than the sum of its proper divisors (31285700976448).

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

21544523023040 is a wasteful number, since it uses less digits than its factorization.

21544523023040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7727 (or 7717 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 21544523023040 its reverse (4032032544512), we get a palindrome (25576555567552).

The spelling of 21544523023040 in words is "twenty-one trillion, five hundred forty-four billion, five hundred twenty-three million, twenty-three thousand, forty".