21400543110405 has 8 divisors (see below), whose sum is σ = 34240868976672. Its totient is φ = 11413622992208.

The previous prime is 21400543110379. The next prime is 21400543110407. The reversal of 21400543110405 is 50401134500412.

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 21400543110405 - 2⁴² = 17002496599301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400543110407) 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, 713351436999 + ... + 713351437028.

It is an arithmetic number, because the mean of its divisors is an integer number (4280108622084).

Almost surely, 2^{21400543110405} is an apocalyptic number.

It is an amenable number.

21400543110405 is a deficient number, since it is larger than the sum of its proper divisors (12840325866267).

21400543110405 is a wasteful number, since it uses less digits than its factorization.

21400543110405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426702874035.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21400543110405 its reverse (50401134500412), we get a palindrome (71801677610817).

The spelling of 21400543110405 in words is "twenty-one trillion, four hundred billion, five hundred forty-three million, one hundred ten thousand, four hundred five".