21000023023 has 8 divisors (see below), whose sum is σ = 24000952448. Its totient is φ = 17999325144.

The previous prime is 21000023021. The next prime is 21000023027. The reversal of 21000023023 is 32032000012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21000023023 - 2¹ = 21000023021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000022994 and 21000023012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000023021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235840 + ... + 312442.

It is an arithmetic number, because the mean of its divisors is an integer number (3000119056).

Almost surely, 2^21000023023 is an apocalyptic number.

21000023023 is a deficient number, since it is larger than the sum of its proper divisors (3000929425).

21000023023 is an equidigital number, since it uses as much as digits as its factorization.

21000023023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115773.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21000023023 its reverse (32032000012), we get a palindrome (53032023035).

The spelling of 21000023023 in words is "twenty-one billion, twenty-three thousand, twenty-three".