21412404232321 has 8 divisors (see below), whose sum is σ = 21428918275464. Its totient is φ = 21395894922240.

The previous prime is 21412404232259. The next prime is 21412404232381. The reversal of 21412404232321 is 12323240421412.

It can be written as a sum of positive squares in 4 ways, for example, as 3586993572096 + 17825410660225 = 1893936^2 + 4222015^2 .

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 21412404232321 - 2¹³ = 21412404224129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412404232381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7895065 + ... + 10254601.

It is an arithmetic number, because the mean of its divisors is an integer number (2678614784433).

Almost surely, 2^{21412404232321} is an apocalyptic number.

It is an amenable number.

21412404232321 is a deficient number, since it is larger than the sum of its proper divisors (16514043143).

21412404232321 is a wasteful number, since it uses less digits than its factorization.

21412404232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366531.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21412404232321 its reverse (12323240421412), we get a palindrome (33735644653733).

The spelling of 21412404232321 in words is "twenty-one trillion, four hundred twelve billion, four hundred four million, two hundred thirty-two thousand, three hundred twenty-one".