21313123143 has 64 divisors (see below), whose sum is σ = 31813189632. Its totient is φ = 12610805760.

The previous prime is 21313123123. The next prime is 21313123157. The reversal of 21313123143 is 34132131312.

It is not a de Polignac number, because 21313123143 - 2⁹ = 21313122631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313123123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19606746 + ... + 19607832.

It is an arithmetic number, because the mean of its divisors is an integer number (497081088).

Almost surely, 2^21313123143 is an apocalyptic number.

21313123143 is a deficient number, since it is larger than the sum of its proper divisors (10500066489).

21313123143 is a wasteful number, since it uses less digits than its factorization.

21313123143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its digits is 1296, while the sum is 24.

Adding to 21313123143 its reverse (34132131312), we get a palindrome (55445254455).

The spelling of 21313123143 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-three thousand, one hundred forty-three".