21312310123 has 8 divisors (see below), whose sum is σ = 22955437008. Its totient is φ = 19669714464.

The previous prime is 21312310093. The next prime is 21312310153. The reversal of 21312310123 is 32101321312.

It is an interprime number because it is at equal distance from previous prime (21312310093) and next prime (21312310153).

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

It is a cyclic number.

It is not a de Polignac number, because 21312310123 - 2²¹ = 21310212971 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 21312310123.

It is not an unprimeable number, because it can be changed into a prime (21312310153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47440 + ... + 211837.

It is an arithmetic number, because the mean of its divisors is an integer number (2869429626).

Almost surely, 2^21312310123 is an apocalyptic number.

21312310123 is a deficient number, since it is larger than the sum of its proper divisors (1643126885).

21312310123 is a wasteful number, since it uses less digits than its factorization.

21312310123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265613.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21312310123 its reverse (32101321312), we get a palindrome (53413631435).

The spelling of 21312310123 in words is "twenty-one billion, three hundred twelve million, three hundred ten thousand, one hundred twenty-three".