21340443130321 has 16 divisors (see below), whose sum is σ = 24439809245184. Its totient is φ = 18253798882704.

The previous prime is 21340443130313. The next prime is 21340443130343. The reversal of 21340443130321 is 12303134404312.

It is not a de Polignac number, because 21340443130321 - 2³ = 21340443130313 is a prime.

It is a super-2 number, since 2×21340443130321² (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 (21340443134321) 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, 4941636 + ... + 8191498.

It is an arithmetic number, because the mean of its divisors is an integer number (1527488077824).

Almost surely, 2^{21340443130321} is an apocalyptic number.

It is an amenable number.

21340443130321 is a deficient number, since it is larger than the sum of its proper divisors (3099366114863).

21340443130321 is a wasteful number, since it uses less digits than its factorization.

21340443130321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251820.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21340443130321 its reverse (12303134404312), we get a palindrome (33643577534633).

The spelling of 21340443130321 in words is "twenty-one trillion, three hundred forty billion, four hundred forty-three million, one hundred thirty thousand, three hundred twenty-one".