21243013023 has 8 divisors (see below), whose sum is σ = 29814755200. Its totient is φ = 13416639768.

The previous prime is 21243012977. The next prime is 21243013031. The reversal of 21243013023 is 32031034212.

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

It is not a de Polignac number, because 21243013023 - 2¹⁴ = 21242996639 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 (21243013063) 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, 186342163 + ... + 186342276.

It is an arithmetic number, because the mean of its divisors is an integer number (3726844400).

Almost surely, 2^21243013023 is an apocalyptic number.

21243013023 is a deficient number, since it is larger than the sum of its proper divisors (8571742177).

21243013023 is a wasteful number, since it uses less digits than its factorization.

21243013023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372684461.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21243013023 its reverse (32031034212), we get a palindrome (53274047235).

The spelling of 21243013023 in words is "twenty-one billion, two hundred forty-three million, thirteen thousand, twenty-three".