21412313123 has 4 divisors (see below), whose sum is σ = 21438143040. Its totient is φ = 21386483208.

The previous prime is 21412313081. The next prime is 21412313129. The reversal of 21412313123 is 32131321412.

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 21412313123 - 2¹⁶ = 21412247587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412313129) 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, 12913715 + ... + 12915372.

It is an arithmetic number, because the mean of its divisors is an integer number (5359535760).

Almost surely, 2^21412313123 is an apocalyptic number.

21412313123 is a deficient number, since it is larger than the sum of its proper divisors (25829917).

21412313123 is an equidigital number, since it uses as much as digits as its factorization.

21412313123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25829916.

The product of its digits is 864, while the sum is 23.

Adding to 21412313123 its reverse (32131321412), we get a palindrome (53543634535).

The spelling of 21412313123 in words is "twenty-one billion, four hundred twelve million, three hundred thirteen thousand, one hundred twenty-three".