2012321543 has 16 divisors (see below), whose sum is σ = 2143889856. Its totient is φ = 1884579840.

The previous prime is 2012321537. The next prime is 2012321557. The reversal of 2012321543 is 3451232102.

It is a cyclic number.

It is not a de Polignac number, because 2012321543 - 2⁴ = 2012321527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012321573) 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 15 ways as a sum of consecutive naturals, for example, 701933 + ... + 704793.

It is an arithmetic number, because the mean of its divisors is an integer number (133993116).

Almost surely, 2^2012321543 is an apocalyptic number.

2012321543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2012321543 is a deficient number, since it is larger than the sum of its proper divisors (131568313).

2012321543 is a wasteful number, since it uses less digits than its factorization.

2012321543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514.

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

The square root of 2012321543 is about 44858.9070642609. The cubic root of 2012321543 is about 1262.5031165234.

Adding to 2012321543 its reverse (3451232102), we get a palindrome (5463553645).

The spelling of 2012321543 in words is "two billion, twelve million, three hundred twenty-one thousand, five hundred forty-three".