21324213123 has 32 divisors (see below), whose sum is σ = 30006761472. Its totient is φ = 13443408000.

The previous prime is 21324213107. The next prime is 21324213137. The reversal of 21324213123 is 32131242312.

It is not a de Polignac number, because 21324213123 - 2⁴ = 21324213107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21324213093 and 21324213102.

It is not an unprimeable number, because it can be changed into a prime (21324213103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5719686 + ... + 5723412.

It is an arithmetic number, because the mean of its divisors is an integer number (937711296).

Almost surely, 2^21324213123 is an apocalyptic number.

21324213123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21324213123 is a deficient number, since it is larger than the sum of its proper divisors (8682548349).

21324213123 is a wasteful number, since it uses less digits than its factorization.

21324213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4675.

The product of its digits is 1728, while the sum is 24.

Adding to 21324213123 its reverse (32131242312), we get a palindrome (53455455435).

The spelling of 21324213123 in words is "twenty-one billion, three hundred twenty-four million, two hundred thirteen thousand, one hundred twenty-three".