21343012244123 has 4 divisors (see below), whose sum is σ = 21349343606808. Its totient is φ = 21336680881440.

The previous prime is 21343012244039. The next prime is 21343012244131. The reversal of 21343012244123 is 32144221034312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21343012244123 - 2¹⁸ = 21343011981979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21343012244123.

It is not an unprimeable number, because it can be changed into a prime (21343012244153) 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, 3165676286 + ... + 3165683027.

It is an arithmetic number, because the mean of its divisors is an integer number (5337335901702).

Almost surely, 2^{21343012244123} is an apocalyptic number.

21343012244123 is a deficient number, since it is larger than the sum of its proper divisors (6331362685).

21343012244123 is an equidigital number, since it uses as much as digits as its factorization.

21343012244123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6331362684.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21343012244123 its reverse (32144221034312), we get a palindrome (53487233278435).

The spelling of 21343012244123 in words is "twenty-one trillion, three hundred forty-three billion, twelve million, two hundred forty-four thousand, one hundred twenty-three".