21134543552 has 28 divisors (see below), whose sum is σ = 42961764216. Its totient is φ = 10309532160.

The previous prime is 21134543453. The next prime is 21134543557. The reversal of 21134543552 is 25534543112.

It is not an unprimeable number, because it can be changed into a prime (21134543557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4024538 + ... + 4029785.

It is an arithmetic number, because the mean of its divisors is an integer number (1534348722).

Almost surely, 2^21134543552 is an apocalyptic number.

It is an amenable number.

21134543552 is an abundant number, since it is smaller than the sum of its proper divisors (21827220664).

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

21134543552 is an equidigital number, since it uses as much as digits as its factorization.

21134543552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8054376 (or 8054366 counting only the distinct ones).

The product of its digits is 72000, while the sum is 35.

The spelling of 21134543552 in words is "twenty-one billion, one hundred thirty-four million, five hundred forty-three thousand, five hundred fifty-two".