21340431300343 has 4 divisors (see below), whose sum is σ = 21340782395488. Its totient is φ = 21340080205200.

The previous prime is 21340431300323. The next prime is 21340431300347. The reversal of 21340431300343 is 34300313404312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21340431300343 - 2²⁹ = 21339894429431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340431300347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175456383 + ... + 175577968.

It is an arithmetic number, because the mean of its divisors is an integer number (5335195598872).

Almost surely, 2^{21340431300343} is an apocalyptic number.

21340431300343 is a deficient number, since it is larger than the sum of its proper divisors (351095145).

21340431300343 is an equidigital number, since it uses as much as digits as its factorization.

21340431300343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351095144.

The product of its (nonzero) digits is 31104, while the sum is 31.

Adding to 21340431300343 its reverse (34300313404312), we get a palindrome (55640744704655).

The spelling of 21340431300343 in words is "twenty-one trillion, three hundred forty billion, four hundred thirty-one million, three hundred thousand, three hundred forty-three".