21311223101123 has 8 divisors (see below), whose sum is σ = 21806895726000. Its totient is φ = 20815553330208.

The previous prime is 21311223101107. The next prime is 21311223101159. The reversal of 21311223101123 is 32110132211312.

It is a happy number.

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 21311223101123 - 2⁴ = 21311223101107 is a prime.

It is a super-2 number, since 2×21311223101123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311223101183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25281653 + ... + 26111001.

It is an arithmetic number, because the mean of its divisors is an integer number (2725861965750).

Almost surely, 2^{21311223101123} is an apocalyptic number.

21311223101123 is a deficient number, since it is larger than the sum of its proper divisors (495672624877).

21311223101123 is an equidigital number, since it uses as much as digits as its factorization.

21311223101123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426981.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21311223101123 its reverse (32110132211312), we get a palindrome (53421355312435).

The spelling of 21311223101123 in words is "twenty-one trillion, three hundred eleven billion, two hundred twenty-three million, one hundred one thousand, one hundred twenty-three".