20104716421 has 2 divisors, whose sum is σ = 20104716422. Its totient is φ = 20104716420.

The previous prime is 20104716419. The next prime is 20104716433. The reversal of 20104716421 is 12461740102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15746736196 + 4357980225 = 125486^2 + 66015^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104716421 - 2¹ = 20104716419 is a prime.

Together with 20104716419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20104716421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20104716451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052358210 + 10052358211.

It is an arithmetic number, because the mean of its divisors is an integer number (10052358211).

Almost surely, 2^20104716421 is an apocalyptic number.

It is an amenable number.

20104716421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104716421 is an equidigital number, since it uses as much as digits as its factorization.

20104716421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 20104716421 in words is "twenty billion, one hundred four million, seven hundred sixteen thousand, four hundred twenty-one".