21324323121 has 16 divisors (see below), whose sum is σ = 29358379008. Its totient is φ = 13753515600.

The previous prime is 21324323101. The next prime is 21324323129. The reversal of 21324323121 is 12132342312.

It is not a de Polignac number, because 21324323121 - 2¹⁴ = 21324306737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21324323091 and 21324323100.

It is not an unprimeable number, because it can be changed into a prime (21324323129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295506 + ... + 360516.

It is an arithmetic number, because the mean of its divisors is an integer number (1834898688).

Almost surely, 2^21324323121 is an apocalyptic number.

It is an amenable number.

21324323121 is a deficient number, since it is larger than the sum of its proper divisors (8034055887).

21324323121 is a wasteful number, since it uses less digits than its factorization.

21324323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68572.

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

Adding to 21324323121 its reverse (12132342312), we get a palindrome (33456665433).

The spelling of 21324323121 in words is "twenty-one billion, three hundred twenty-four million, three hundred twenty-three thousand, one hundred twenty-one".