21532453550520 has 256 divisors, whose sum is σ = 70692633722880. Its totient is φ = 5203498713600.

The previous prime is 21532453550507. The next prime is 21532453550521. The reversal of 21532453550520 is 2505535423512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532453550521) 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, 1290055375 + ... + 1290072065.

It is an arithmetic number, because the mean of its divisors is an integer number (276143100480).

Almost surely, 2^{21532453550520} is an apocalyptic number.

21532453550520 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 21532453550520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35346316861440).

21532453550520 is an abundant number, since it is smaller than the sum of its proper divisors (49160180172360).

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

21532453550520 is a wasteful number, since it uses less digits than its factorization.

21532453550520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19746 (or 19742 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 42.

The spelling of 21532453550520 in words is "twenty-one trillion, five hundred thirty-two billion, four hundred fifty-three million, five hundred fifty thousand, five hundred twenty".