21543503112 has 24 divisors (see below), whose sum is σ = 58346987790. Its totient is φ = 7181167680.

The previous prime is 21543503087. The next prime is 21543503119. The reversal of 21543503112 is 21130534512.

21543503112 is a `hidden beast` number, since 2 + 1 + 5 + 43 + 503 + 112 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20018288196 + 1525214916 = 141486^2 + 39054^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (21543503119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 149607589 + ... + 149607732.

Almost surely, 2^21543503112 is an apocalyptic number.

It is an amenable number.

21543503112 is an abundant number, since it is smaller than the sum of its proper divisors (36803484678).

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

21543503112 is a wasteful number, since it uses less digits than its factorization.

21543503112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299215333 (or 299215326 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21543503112 in words is "twenty-one billion, five hundred forty-three million, five hundred three thousand, one hundred twelve".