21535852480 has 56 divisors (see below), whose sum is σ = 53981329680. Its totient is φ = 8160952320.

The previous prime is 21535852463. The next prime is 21535852483. The reversal of 21535852480 is 8425853512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535852483) by changing a digit.

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, 1764961 + ... + 1777120.

Almost surely, 2^21535852480 is an apocalyptic number.

21535852480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21535852480 is an abundant number, since it is smaller than the sum of its proper divisors (32445477200).

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

21535852480 is a wasteful number, since it uses less digits than its factorization.

21535852480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3542117 (or 3542107 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 43.

The spelling of 21535852480 in words is "twenty-one billion, five hundred thirty-five million, eight hundred fifty-two thousand, four hundred eighty".