20124010420421 has 4 divisors (see below), whose sum is σ = 20136918703200. Its totient is φ = 20111102137644.

The previous prime is 20124010420387. The next prime is 20124010420447. The reversal of 20124010420421 is 12402401042102.

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.

It is a cyclic number.

It is not a de Polignac number, because 20124010420421 - 2⁶ = 20124010420357 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 (20124010420121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6454139051 + ... + 6454142168.

It is an arithmetic number, because the mean of its divisors is an integer number (5034229675800).

Almost surely, 2^{20124010420421} is an apocalyptic number.

It is an amenable number.

20124010420421 is a deficient number, since it is larger than the sum of its proper divisors (12908282779).

20124010420421 is a wasteful number, since it uses less digits than its factorization.

20124010420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12908282778.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 20124010420421 its reverse (12402401042102), we get a palindrome (32526411462523).

The spelling of 20124010420421 in words is "twenty trillion, one hundred twenty-four billion, ten million, four hundred twenty thousand, four hundred twenty-one".