21433645103543 has 16 divisors (see below), whose sum is σ = 23507634192000. Its totient is φ = 19464320971872.

The previous prime is 21433645103527. The next prime is 21433645103573. The reversal of 21433645103543 is 34530154633412.

It is a happy number.

It is not a de Polignac number, because 21433645103543 - 2⁴ = 21433645103527 is a prime.

It is a super-3 number, since 3×21433645103543³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21433645103494 and 21433645103503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433645103573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139849805 + ... + 140002982.

It is an arithmetic number, because the mean of its divisors is an integer number (1469227137000).

Almost surely, 2^{21433645103543} is an apocalyptic number.

21433645103543 is a deficient number, since it is larger than the sum of its proper divisors (2073989088457).

21433645103543 is a wasteful number, since it uses less digits than its factorization.

21433645103543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279852974.

The product of its (nonzero) digits is 1555200, while the sum is 44.

Adding to 21433645103543 its reverse (34530154633412), we get a palindrome (55963799736955).

The spelling of 21433645103543 in words is "twenty-one trillion, four hundred thirty-three billion, six hundred forty-five million, one hundred three thousand, five hundred forty-three".