20001212143 has 4 divisors (see below), whose sum is σ = 21819504168.
Its totient is φ = 18182920120.
The previous prime is 20001212141. The next prime is 20001212173. The reversal of 20001212143 is 34121210002.
Adding to 20001212143 its reverse (34121210002), we get a palindrome (54122422145).
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 20001212143 - 21 = 20001212141 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20001212141) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909145996 + ... + 909146017.
It is an arithmetic number, because the mean of its divisors is an integer number (5454876042).
Almost surely, 220001212143 is an apocalyptic number.
20001212143 is a deficient number, since it is larger than the sum of its proper divisors (1818292025).
20001212143 is a wasteful number, since it uses less digits than its factorization.
20001212143 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1818292024.
The product of its (nonzero) digits is 96, while the sum is 16.
The spelling of 20001212143 in words is "twenty billion, one million, two hundred twelve thousand, one hundred forty-three".