21545366484 has 12 divisors (see below), whose sum is σ = 50272521824. Its totient is φ = 7181788824.

The previous prime is 21545366467. The next prime is 21545366509. The reversal of 21545366484 is 48466354512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897723592 + ... + 897723615.

Almost surely, 2^21545366484 is an apocalyptic number.

It is an amenable number.

21545366484 is an abundant number, since it is smaller than the sum of its proper divisors (28727155340).

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

21545366484 is a wasteful number, since it uses less digits than its factorization.

21545366484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795447214 (or 1795447212 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 48.

The spelling of 21545366484 in words is "twenty-one billion, five hundred forty-five million, three hundred sixty-six thousand, four hundred eighty-four".