21042044023 has 32 divisors (see below), whose sum is σ = 28909343232. Its totient is φ = 14783126400.

The previous prime is 21042043999. The next prime is 21042044069. The reversal of 21042044023 is 32044024012.

It is a happy number.

It is not a de Polignac number, because 21042044023 - 2⁵ = 21042043991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21042043985 and 21042044003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042014023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201388 + ... + 287473.

It is an arithmetic number, because the mean of its divisors is an integer number (903416976).

Almost surely, 2^21042044023 is an apocalyptic number.

21042044023 is a deficient number, since it is larger than the sum of its proper divisors (7867299209).

21042044023 is a wasteful number, since it uses less digits than its factorization.

21042044023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488935.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21042044023 its reverse (32044024012), we get a palindrome (53086068035).

The spelling of 21042044023 in words is "twenty-one billion, forty-two million, forty-four thousand, twenty-three".