21010434500023 has 2 divisors, whose sum is σ = 21010434500024. Its totient is φ = 21010434500022.

The previous prime is 21010434500021. The next prime is 21010434500093. The reversal of 21010434500023 is 32000543401012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010434500023 - 2¹ = 21010434500021 is a prime.

Together with 21010434500021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010434500021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505217250011 + 10505217250012.

It is an arithmetic number, because the mean of its divisors is an integer number (10505217250012).

Almost surely, 2^{21010434500023} is an apocalyptic number.

21010434500023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010434500023 is an equidigital number, since it uses as much as digits as its factorization.

21010434500023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21010434500023 its reverse (32000543401012), we get a palindrome (53010977901035).

It can be divided in two parts, 2101043 and 4500023, that added together give a palindrome (6601066).

The spelling of 21010434500023 in words is "twenty-one trillion, ten billion, four hundred thirty-four million, five hundred thousand, twenty-three".