21044004023 has 8 divisors (see below), whose sum is σ = 24086031648. Its totient is φ = 18010911744.

The previous prime is 21044004017. The next prime is 21044004029. The reversal of 21044004023 is 32040044012.

It is an interprime number because it is at equal distance from previous prime (21044004017) and next prime (21044004029).

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

It is not a de Polignac number, because 21044004023 - 2¹⁴ = 21043987639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21044003986 and 21044004004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044004029) 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, 2228786 + ... + 2238207.

It is an arithmetic number, because the mean of its divisors is an integer number (3010753956).

Almost surely, 2^21044004023 is an apocalyptic number.

21044004023 is a deficient number, since it is larger than the sum of its proper divisors (3042027625).

21044004023 is an equidigital number, since it uses as much as digits as its factorization.

21044004023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4467673.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21044004023 its reverse (32040044012), we get a palindrome (53084048035).

The spelling of 21044004023 in words is "twenty-one billion, forty-four million, four thousand, twenty-three".