21543145532 has 12 divisors (see below), whose sum is σ = 38411835336. Its totient is φ = 10568335440.

The previous prime is 21543145529. The next prime is 21543145541. The reversal of 21543145532 is 23554134512.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21543145492 and 21543145501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50809094 + ... + 50809517.

It is an arithmetic number, because the mean of its divisors is an integer number (3200986278).

Almost surely, 2^21543145532 is an apocalyptic number.

It is an amenable number.

21543145532 is a deficient number, since it is larger than the sum of its proper divisors (16868689804).

21543145532 is a wasteful number, since it uses less digits than its factorization.

21543145532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101618668 (or 101618666 counting only the distinct ones).

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

The spelling of 21543145532 in words is "twenty-one billion, five hundred forty-three million, one hundred forty-five thousand, five hundred thirty-two".