21535532320 has 48 divisors (see below), whose sum is σ = 50918019768. Its totient is φ = 8607385600.

The previous prime is 21535532287. The next prime is 21535532341. The reversal of 21535532320 is 2323553512.

It can be written as a sum of positive squares in 4 ways, for example, as 11473837456 + 10061694864 = 107116^2 + 100308^2 .

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 7 ways as a sum of consecutive naturals, for example, 151620 + ... + 257020.

Almost surely, 2^21535532320 is an apocalyptic number.

21535532320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21535532320 is an abundant number, since it is smaller than the sum of its proper divisors (29382487448).

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

21535532320 is a wasteful number, since it uses less digits than its factorization.

21535532320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106693 (or 106685 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 31.

The spelling of 21535532320 in words is "twenty-one billion, five hundred thirty-five million, five hundred thirty-two thousand, three hundred twenty".