20121032543 has 4 divisors (see below), whose sum is σ = 20128523520. Its totient is φ = 20113541568.

The previous prime is 20121032497. The next prime is 20121032597. The reversal of 20121032543 is 34523012102.

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 20121032543 - 2⁶ = 20121032479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121034543) 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, 3741458 + ... + 3746831.

It is an arithmetic number, because the mean of its divisors is an integer number (5032130880).

Almost surely, 2^20121032543 is an apocalyptic number.

20121032543 is a deficient number, since it is larger than the sum of its proper divisors (7490977).

20121032543 is an equidigital number, since it uses as much as digits as its factorization.

20121032543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490976.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20121032543 its reverse (34523012102), we get a palindrome (54644044645).

The spelling of 20121032543 in words is "twenty billion, one hundred twenty-one million, thirty-two thousand, five hundred forty-three".