21304002023 has 4 divisors (see below), whose sum is σ = 21304922160. Its totient is φ = 21303081888.

The previous prime is 21304002019. The next prime is 21304002029. The reversal of 21304002023 is 32020040312.

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

It is a cyclic number.

It is not a de Polignac number, because 21304002023 - 2² = 21304002019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21304001992 and 21304002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304002029) 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, 424418 + ... + 471951.

It is an arithmetic number, because the mean of its divisors is an integer number (5326230540).

Almost surely, 2^21304002023 is an apocalyptic number.

21304002023 is a deficient number, since it is larger than the sum of its proper divisors (920137).

21304002023 is an equidigital number, since it uses as much as digits as its factorization.

21304002023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920136.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21304002023 its reverse (32020040312), we get a palindrome (53324042335).

The spelling of 21304002023 in words is "twenty-one billion, three hundred four million, two thousand, twenty-three".