20412121543 has 16 divisors (see below), whose sum is σ = 23341393152. Its totient is φ = 17682840000.

The previous prime is 20412121529. The next prime is 20412121601. The reversal of 20412121543 is 34512121402.

It is a cyclic number.

It is not a de Polignac number, because 20412121543 - 2⁹ = 20412121031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412121043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506883 + ... + 545668.

It is an arithmetic number, because the mean of its divisors is an integer number (1458837072).

Almost surely, 2^20412121543 is an apocalyptic number.

20412121543 is a deficient number, since it is larger than the sum of its proper divisors (2929271609).

20412121543 is a wasteful number, since it uses less digits than its factorization.

20412121543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052646.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 20412121543 its reverse (34512121402), we get a palindrome (54924242945).

The spelling of 20412121543 in words is "twenty billion, four hundred twelve million, one hundred twenty-one thousand, five hundred forty-three".