20105411421023 has 2 divisors, whose sum is σ = 20105411421024. Its totient is φ = 20105411421022.

The previous prime is 20105411420977. The next prime is 20105411421103. The reversal of 20105411421023 is 32012411450102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20105411421023 - 2⁸ = 20105411420767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20105411420983 and 20105411421001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20105411451023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052705710511 + 10052705710512.

It is an arithmetic number, because the mean of its divisors is an integer number (10052705710512).

Almost surely, 2^{20105411421023} is an apocalyptic number.

20105411421023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20105411421023 is an equidigital number, since it uses as much as digits as its factorization.

20105411421023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 20105411421023 its reverse (32012411450102), we get a palindrome (52117822871125).

The spelling of 20105411421023 in words is "twenty trillion, one hundred five billion, four hundred eleven million, four hundred twenty-one thousand, twenty-three".