21406632314543 has 4 divisors (see below), whose sum is σ = 24464722645200. Its totient is φ = 18348541983888.

The previous prime is 21406632314531. The next prime is 21406632314563. The reversal of 21406632314543 is 34541323660412.

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 21406632314543 - 2⁴ = 21406632314527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21406632314494 and 21406632314503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21406632314563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1529045165318 + ... + 1529045165331.

It is an arithmetic number, because the mean of its divisors is an integer number (6116180661300).

Almost surely, 2^{21406632314543} is an apocalyptic number.

21406632314543 is a deficient number, since it is larger than the sum of its proper divisors (3058090330657).

21406632314543 is an equidigital number, since it uses as much as digits as its factorization.

21406632314543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058090330656.

The product of its (nonzero) digits is 1244160, while the sum is 44.

Adding to 21406632314543 its reverse (34541323660412), we get a palindrome (55947955974955).

The spelling of 21406632314543 in words is "twenty-one trillion, four hundred six billion, six hundred thirty-two million, three hundred fourteen thousand, five hundred forty-three".