21453756105343 has 4 divisors (see below), whose sum is σ = 21712235094648. Its totient is φ = 21195277116040.

The previous prime is 21453756105259. The next prime is 21453756105349. The reversal of 21453756105343 is 34350165735412.

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 21453756105343 - 2³³ = 21445166170751 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 (21453756105349) 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, 129239494528 + ... + 129239494693.

It is an arithmetic number, because the mean of its divisors is an integer number (5428058773662).

Almost surely, 2^{21453756105343} is an apocalyptic number.

21453756105343 is a deficient number, since it is larger than the sum of its proper divisors (258478989305).

21453756105343 is an equidigital number, since it uses as much as digits as its factorization.

21453756105343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258478989304.

The product of its (nonzero) digits is 4536000, while the sum is 49.

The spelling of 21453756105343 in words is "twenty-one trillion, four hundred fifty-three billion, seven hundred fifty-six million, one hundred five thousand, three hundred forty-three".