12021063543 has 24 divisors (see below), whose sum is σ = 17451994560. Its totient is φ = 7973380800.

The previous prime is 12021063539. The next prime is 12021063559. The reversal of 12021063543 is 34536012021.

12021063543 is a `hidden beast` number, since 1 + 2 + 0 + 21 + 0 + 635 + 4 + 3 = 666.

It is not a de Polignac number, because 12021063543 - 2² = 12021063539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020063543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3639993 + ... + 3643293.

It is an arithmetic number, because the mean of its divisors is an integer number (727166440).

Almost surely, 2^12021063543 is an apocalyptic number.

12021063543 is a deficient number, since it is larger than the sum of its proper divisors (5430931017).

12021063543 is a wasteful number, since it uses less digits than its factorization.

12021063543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239 (or 5236 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 12021063543 its reverse (34536012021), we get a palindrome (46557075564).

The spelling of 12021063543 in words is "twelve billion, twenty-one million, sixty-three thousand, five hundred forty-three".