20221000543 has 4 divisors (see below), whose sum is σ = 20222534560. Its totient is φ = 20219466528.

The previous prime is 20221000519. The next prime is 20221000601. The reversal of 20221000543 is 34500012202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20221000543 - 2²⁹ = 19684129631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20221000543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221060543) 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, 747063 + ... + 773656.

It is an arithmetic number, because the mean of its divisors is an integer number (5055633640).

Almost surely, 2^20221000543 is an apocalyptic number.

20221000543 is a deficient number, since it is larger than the sum of its proper divisors (1534017).

20221000543 is a wasteful number, since it uses less digits than its factorization.

20221000543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534016.

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 20221000543 its reverse (34500012202), we get a palindrome (54721012745).

The spelling of 20221000543 in words is "twenty billion, two hundred twenty-one million, five hundred forty-three", and thus it is an aban number.