21313011111123 has 4 divisors (see below), whose sum is σ = 28417348148168. Its totient is φ = 14208674074080.

The previous prime is 21313011111101. The next prime is 21313011111131. The reversal of 21313011111123 is 32111111031312.

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

It is not a de Polignac number, because 21313011111123 - 2¹⁰ = 21313011110099 is a prime.

It is a super-2 number, since 2×21313011111123² (a number of 27 digits) contains 22 as substring.

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 21313011111123.

It is not an unprimeable number, because it can be changed into a prime (21313011111163) 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, 3552168518518 + ... + 3552168518523.

It is an arithmetic number, because the mean of its divisors is an integer number (7104337037042).

Almost surely, 2^{21313011111123} is an apocalyptic number.

21313011111123 is a deficient number, since it is larger than the sum of its proper divisors (7104337037045).

21313011111123 is an equidigital number, since it uses as much as digits as its factorization.

21313011111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104337037044.

The product of its (nonzero) digits is 108, while the sum is 21.

Adding to 21313011111123 its reverse (32111111031312), we get a palindrome (53424122142435).

The spelling of 21313011111123 in words is "twenty-one trillion, three hundred thirteen billion, eleven million, one hundred eleven thousand, one hundred twenty-three".