21004234023 has 8 divisors (see below), whose sum is σ = 28028290288. Its totient is φ = 13991500224.

The previous prime is 21004234003. The next prime is 21004234033. The reversal of 21004234023 is 32043240012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21004234023 - 2⁶ = 21004233959 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 (21004234003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2826286 + ... + 2833707.

It is an arithmetic number, because the mean of its divisors is an integer number (3503536286).

Almost surely, 2^21004234023 is an apocalyptic number.

21004234023 is a deficient number, since it is larger than the sum of its proper divisors (7024056265).

21004234023 is a wasteful number, since it uses less digits than its factorization.

21004234023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661233.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21004234023 its reverse (32043240012), we get a palindrome (53047474035).

The spelling of 21004234023 in words is "twenty-one billion, four million, two hundred thirty-four thousand, twenty-three".