21034143023 has 2 divisors, whose sum is σ = 21034143024. Its totient is φ = 21034143022.

The previous prime is 21034143017. The next prime is 21034143077. The reversal of 21034143023 is 32034143012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21034143023 - 2²⁶ = 20967034159 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21034143023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21034143083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517071511 + 10517071512.

It is an arithmetic number, because the mean of its divisors is an integer number (10517071512).

Almost surely, 2^21034143023 is an apocalyptic number.

21034143023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034143023 is an equidigital number, since it uses as much as digits as its factorization.

21034143023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21034143023 its reverse (32034143012), we get a palindrome (53068286035).

The spelling of 21034143023 in words is "twenty-one billion, thirty-four million, one hundred forty-three thousand, twenty-three".