21044200343 has 4 divisors (see below), whose sum is σ = 21261150960. Its totient is φ = 20827249728.

The previous prime is 21044200271. The next prime is 21044200361. The reversal of 21044200343 is 34300244012.

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 21044200343 - 2¹⁸ = 21043938199 is a prime.

It is a super-4 number, since 4×21044200343⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044200393) 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 3 ways as a sum of consecutive naturals, for example, 108475163 + ... + 108475356.

It is an arithmetic number, because the mean of its divisors is an integer number (5315287740).

Almost surely, 2^21044200343 is an apocalyptic number.

21044200343 is a deficient number, since it is larger than the sum of its proper divisors (216950617).

21044200343 is an equidigital number, since it uses as much as digits as its factorization.

21044200343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216950616.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21044200343 its reverse (34300244012), we get a palindrome (55344444355).

The spelling of 21044200343 in words is "twenty-one billion, forty-four million, two hundred thousand, three hundred forty-three".