21403411243 has 8 divisors (see below), whose sum is σ = 21439501200. Its totient is φ = 21367346688.

The previous prime is 21403411241. The next prime is 21403411259. The reversal of 21403411243 is 34211430412.

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 21403411243 - 2¹ = 21403411241 is a prime.

It is a super-4 number, since 4×21403411243⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21403411241) 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, 2392603 + ... + 2401531.

It is an arithmetic number, because the mean of its divisors is an integer number (2679937650).

Almost surely, 2^21403411243 is an apocalyptic number.

21403411243 is a deficient number, since it is larger than the sum of its proper divisors (36089957).

21403411243 is an equidigital number, since it uses as much as digits as its factorization.

21403411243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12701.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21403411243 its reverse (34211430412), we get a palindrome (55614841655).

The spelling of 21403411243 in words is "twenty-one billion, four hundred three million, four hundred eleven thousand, two hundred forty-three".