20124242043421 has 4 divisors (see below), whose sum is σ = 20124251053632. Its totient is φ = 20124233033212.

The previous prime is 20124242043419. The next prime is 20124242043491. The reversal of 20124242043421 is 12434024242102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20124242043421 - 2¹ = 20124242043419 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 (20124242043491) 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, 1630950 + ... + 6550456.

It is an arithmetic number, because the mean of its divisors is an integer number (5031062763408).

Almost surely, 2^{20124242043421} is an apocalyptic number.

It is an amenable number.

20124242043421 is a deficient number, since it is larger than the sum of its proper divisors (9010211).

20124242043421 is an equidigital number, since it uses as much as digits as its factorization.

20124242043421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9010210.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 20124242043421 its reverse (12434024242102), we get a palindrome (32558266285523).

The spelling of 20124242043421 in words is "twenty trillion, one hundred twenty-four billion, two hundred forty-two million, forty-three thousand, four hundred twenty-one".