21552440531020 has 192 divisors, whose sum is σ = 53521024306176. Its totient is φ = 7138122900480.

The previous prime is 21552440530991. The next prime is 21552440531029. The reversal of 21552440531020 is 2013504425512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21552440531029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129328950 + ... + 129495490.

It is an arithmetic number, because the mean of its divisors is an integer number (278755334928).

Almost surely, 2^{21552440531020} is an apocalyptic number.

21552440531020 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 21552440531020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26760512153088).

21552440531020 is an abundant number, since it is smaller than the sum of its proper divisors (31968583775156).

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

21552440531020 is a wasteful number, since it uses less digits than its factorization.

21552440531020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166880 (or 166878 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 21552440531020 its reverse (2013504425512), we get a palindrome (23565944956532).

The spelling of 21552440531020 in words is "twenty-one trillion, five hundred fifty-two billion, four hundred forty million, five hundred thirty-one thousand, twenty".