21345222432543 has 8 divisors (see below), whose sum is σ = 29697700775808. Its totient is φ = 13611446188824.

The previous prime is 21345222432517. The next prime is 21345222432593. The reversal of 21345222432543 is 34523422254312.

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

It is not a de Polignac number, because 21345222432543 - 2¹⁴ = 21345222416159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21345222432495 and 21345222432504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345222432593) 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, 154675524805 + ... + 154675524942.

It is an arithmetic number, because the mean of its divisors is an integer number (3712212596976).

Almost surely, 2^{21345222432543} is an apocalyptic number.

21345222432543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21345222432543 is a deficient number, since it is larger than the sum of its proper divisors (8352478343265).

21345222432543 is a wasteful number, since it uses less digits than its factorization.

21345222432543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309351049773.

The product of its digits is 1382400, while the sum is 42.

Adding to 21345222432543 its reverse (34523422254312), we get a palindrome (55868644686855).

The spelling of 21345222432543 in words is "twenty-one trillion, three hundred forty-five billion, two hundred twenty-two million, four hundred thirty-two thousand, five hundred forty-three".