21243123023443 has 8 divisors (see below), whose sum is σ = 23132257376400. Its totient is φ = 19431096195168.

The previous prime is 21243123023417. The next prime is 21243123023449. The reversal of 21243123023443 is 34432032134212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21243123023443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21243123023399 and 21243123023408.

It is not an unprimeable number, because it can be changed into a prime (21243123023449) 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, 19276880596 + ... + 19276881697.

It is an arithmetic number, because the mean of its divisors is an integer number (2891532172050).

Almost surely, 2^{21243123023443} is an apocalyptic number.

21243123023443 is a deficient number, since it is larger than the sum of its proper divisors (1889134352957).

21243123023443 is a wasteful number, since it uses less digits than its factorization.

21243123023443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38553762341.

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 21243123023443 its reverse (34432032134212), we get a palindrome (55675155157655).

The spelling of 21243123023443 in words is "twenty-one trillion, two hundred forty-three billion, one hundred twenty-three million, twenty-three thousand, four hundred forty-three".