21124344003443 has 4 divisors (see below), whose sum is σ = 21639571906008. Its totient is φ = 20609116100880.

The previous prime is 21124344003437. The next prime is 21124344003473. The reversal of 21124344003443 is 34430044342112.

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 21124344003443 - 2¹⁸ = 21124343741299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124344003473) 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 3 ways as a sum of consecutive naturals, for example, 257613951221 + ... + 257613951302.

It is an arithmetic number, because the mean of its divisors is an integer number (5409892976502).

Almost surely, 2^{21124344003443} is an apocalyptic number.

21124344003443 is a deficient number, since it is larger than the sum of its proper divisors (515227902565).

21124344003443 is an equidigital number, since it uses as much as digits as its factorization.

21124344003443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515227902564.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 21124344003443 its reverse (34430044342112), we get a palindrome (55554388345555).

The spelling of 21124344003443 in words is "twenty-one trillion, one hundred twenty-four billion, three hundred forty-four million, three thousand, four hundred forty-three".