21323542404143 has 8 divisors (see below), whose sum is σ = 24373303375488. Its totient is φ = 18274666589784.

The previous prime is 21323542404113. The next prime is 21323542404149. The reversal of 21323542404143 is 34140424532312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21323542404143 - 2¹⁴ = 21323542387759 is a prime.

It is a super-2 number, since 2×21323542404143² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323542404097 and 21323542404106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323542404149) 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 7 ways as a sum of consecutive naturals, for example, 221237621 + ... + 221333982.

It is an arithmetic number, because the mean of its divisors is an integer number (3046662921936).

Almost surely, 2^{21323542404143} is an apocalyptic number.

21323542404143 is a deficient number, since it is larger than the sum of its proper divisors (3049760971345).

21323542404143 is an equidigital number, since it uses as much as digits as its factorization.

21323542404143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442578493.

The product of its (nonzero) digits is 276480, while the sum is 38.

Adding to 21323542404143 its reverse (34140424532312), we get a palindrome (55463966936455).

The spelling of 21323542404143 in words is "twenty-one trillion, three hundred twenty-three billion, five hundred forty-two million, four hundred four thousand, one hundred forty-three".