21102404543 has 8 divisors (see below), whose sum is σ = 23022576336. Its totient is φ = 19182528000.

The previous prime is 21102404497. The next prime is 21102404551. The reversal of 21102404543 is 34540420112.

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 21102404543 - 2¹⁶ = 21102339007 is a prime.

It is a super-2 number, since 2×21102404543² (a number of 21 digits) contains 22 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 (21102404243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91805 + ... + 225017.

It is an arithmetic number, because the mean of its divisors is an integer number (2877822042).

Almost surely, 2^21102404543 is an apocalyptic number.

21102404543 is a deficient number, since it is larger than the sum of its proper divisors (1920171793).

21102404543 is a wasteful number, since it uses less digits than its factorization.

21102404543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147625.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21102404543 its reverse (34540420112), we get a palindrome (55642824655).

The spelling of 21102404543 in words is "twenty-one billion, one hundred two million, four hundred four thousand, five hundred forty-three".