21034031023 has 2 divisors, whose sum is σ = 21034031024. Its totient is φ = 21034031022.

The previous prime is 21034031021. The next prime is 21034031077. The reversal of 21034031023 is 32013043012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21034031023 - 2¹ = 21034031021 is a prime.

It is a super-2 number, since 2×21034031023² (a number of 21 digits) contains 22 as substring.

Together with 21034031021, 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 (21034031021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517015511 + 10517015512.

It is an arithmetic number, because the mean of its divisors is an integer number (10517015512).

Almost surely, 2^21034031023 is an apocalyptic number.

21034031023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034031023 is an equidigital number, since it uses as much as digits as its factorization.

21034031023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21034031023 its reverse (32013043012), we get a palindrome (53047074035).

The spelling of 21034031023 in words is "twenty-one billion, thirty-four million, thirty-one thousand, twenty-three".