21034011023 has 4 divisors (see below), whose sum is σ = 21034310640. Its totient is φ = 21033711408.

The previous prime is 21034011017. The next prime is 21034011029. The reversal of 21034011023 is 32011043012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (21034011017) and next prime (21034011029).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034011023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21034010992 and 21034011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034011029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18611 + ... + 205947.

It is an arithmetic number, because the mean of its divisors is an integer number (5258577660).

Almost surely, 2^21034011023 is an apocalyptic number.

21034011023 is a deficient number, since it is larger than the sum of its proper divisors (299617).

21034011023 is a wasteful number, since it uses less digits than its factorization.

21034011023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299616.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21034011023 its reverse (32011043012), we get a palindrome (53045054035).

The spelling of 21034011023 in words is "twenty-one billion, thirty-four million, eleven thousand, twenty-three".