21033104023 has 4 divisors (see below), whose sum is σ = 21033895320. Its totient is φ = 21032312728.

The previous prime is 21033103999. The next prime is 21033104033. The reversal of 21033104023 is 32040133012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033104023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033104033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354340 + ... + 409417.

It is an arithmetic number, because the mean of its divisors is an integer number (5258473830).

Almost surely, 2^21033104023 is an apocalyptic number.

21033104023 is a deficient number, since it is larger than the sum of its proper divisors (791297).

21033104023 is an equidigital number, since it uses as much as digits as its factorization.

21033104023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791296.

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

Adding to 21033104023 its reverse (32040133012), we get a palindrome (53073237035).

The spelling of 21033104023 in words is "twenty-one billion, thirty-three million, one hundred four thousand, twenty-three".