21532510525440 has 96 divisors (see below), whose sum is σ = 68887211505840. Its totient is φ = 5742002798592.

The previous prime is 21532510525429. The next prime is 21532510525453. The reversal of 21532510525440 is 4452501523512.

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

It is a super-3 number, since 3×21532510525440³ (a number of 41 digits) contains 333 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 350433319 + ... + 350494758.

Almost surely, 2^{21532510525440} is an apocalyptic number.

21532510525440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21532510525440 is an abundant number, since it is smaller than the sum of its proper divisors (47354700980400).

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

21532510525440 is an equidigital number, since it uses as much as digits as its factorization.

21532510525440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700928107 (or 700928087 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 21532510525440 in words is "twenty-one trillion, five hundred thirty-two billion, five hundred ten million, five hundred twenty-five thousand, four hundred forty".