21532132440 has 192 divisors, whose sum is σ = 86128660800. Its totient is φ = 4543036416.

The previous prime is 21532132439. The next prime is 21532132469. The reversal of 21532132440 is 4423123512.

21532132440 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 213 + 2 + 440 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 295875 + ... + 361394.

It is an arithmetic number, because the mean of its divisors is an integer number (448586775).

Almost surely, 2^21532132440 is an apocalyptic number.

21532132440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21532132440 is an abundant number, since it is smaller than the sum of its proper divisors (64596528360).

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

21532132440 is a wasteful number, since it uses less digits than its factorization.

21532132440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657306 (or 657299 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21532132440 its reverse (4423123512), we get a palindrome (25955255952).

The spelling of 21532132440 in words is "twenty-one billion, five hundred thirty-two million, one hundred thirty-two thousand, four hundred forty".