20112403434421 has 2 divisors, whose sum is σ = 20112403434422. Its totient is φ = 20112403434420.

The previous prime is 20112403434353. The next prime is 20112403434517. The reversal of 20112403434421 is 12443430421102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10844580058321 + 9267823376100 = 3293111^2 + 3044310^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112403434421 - 2⁹ = 20112403433909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112403404421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056201717210 + 10056201717211.

It is an arithmetic number, because the mean of its divisors is an integer number (10056201717211).

Almost surely, 2^{20112403434421} is an apocalyptic number.

It is an amenable number.

20112403434421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112403434421 is an equidigital number, since it uses as much as digits as its factorization.

20112403434421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 20112403434421 its reverse (12443430421102), we get a palindrome (32555833855523).

The spelling of 20112403434421 in words is "twenty trillion, one hundred twelve billion, four hundred three million, four hundred thirty-four thousand, four hundred twenty-one".