21321033412423 has 4 divisors (see below), whose sum is σ = 21723317061768. Its totient is φ = 20918749763080.

The previous prime is 21321033412411. The next prime is 21321033412429. The reversal of 21321033412423 is 32421433012312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321033412423 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 (21321033412429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201141824593 + ... + 201141824698.

It is an arithmetic number, because the mean of its divisors is an integer number (5430829265442).

Almost surely, 2^{21321033412423} is an apocalyptic number.

21321033412423 is a deficient number, since it is larger than the sum of its proper divisors (402283649345).

21321033412423 is an equidigital number, since it uses as much as digits as its factorization.

21321033412423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402283649344.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21321033412423 its reverse (32421433012312), we get a palindrome (53742466424735).

The spelling of 21321033412423 in words is "twenty-one trillion, three hundred twenty-one billion, thirty-three million, four hundred twelve thousand, four hundred twenty-three".