20121324143 has 4 divisors (see below), whose sum is σ = 20134857120. Its totient is φ = 20107791168.

The previous prime is 20121324137. The next prime is 20121324191. The reversal of 20121324143 is 34142312102.

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 20121324143 - 2⁶ = 20121324079 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 (20126324143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6764258 + ... + 6767231.

It is an arithmetic number, because the mean of its divisors is an integer number (5033714280).

Almost surely, 2^20121324143 is an apocalyptic number.

20121324143 is a deficient number, since it is larger than the sum of its proper divisors (13532977).

20121324143 is a wasteful number, since it uses less digits than its factorization.

20121324143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13532976.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20121324143 its reverse (34142312102), we get a palindrome (54263636245).

The spelling of 20121324143 in words is "twenty billion, one hundred twenty-one million, three hundred twenty-four thousand, one hundred forty-three".