21324204213 has 8 divisors (see below), whose sum is σ = 30619370208. Its totient is φ = 13122587184.

The previous prime is 21324204173. The next prime is 21324204221. The reversal of 21324204213 is 31240242312.

It is a happy number.

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

It is not a de Polignac number, because 21324204213 - 2¹⁶ = 21324138677 is a prime.

It is a super-3 number, since 3×21324204213³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324204313) 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, 273387195 + ... + 273387272.

It is an arithmetic number, because the mean of its divisors is an integer number (3827421276).

Almost surely, 2^21324204213 is an apocalyptic number.

It is an amenable number.

21324204213 is a deficient number, since it is larger than the sum of its proper divisors (9295165995).

21324204213 is a wasteful number, since it uses less digits than its factorization.

21324204213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546774483.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21324204213 its reverse (31240242312), we get a palindrome (52564446525).

The spelling of 21324204213 in words is "twenty-one billion, three hundred twenty-four million, two hundred four thousand, two hundred thirteen".