21043402315 has 32 divisors (see below), whose sum is σ = 29496591936. Its totient is φ = 14268887040.

The previous prime is 21043402283. The next prime is 21043402339. The reversal of 21043402315 is 51320434012.

It is not a de Polignac number, because 21043402315 - 2⁵ = 21043402283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21043402315.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186937 + ... + 277546.

It is an arithmetic number, because the mean of its divisors is an integer number (921768498).

Almost surely, 2^21043402315 is an apocalyptic number.

21043402315 is a deficient number, since it is larger than the sum of its proper divisors (8453189621).

21043402315 is a wasteful number, since it uses less digits than its factorization.

21043402315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464559.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21043402315 its reverse (51320434012), we get a palindrome (72363836327).

The spelling of 21043402315 in words is "twenty-one billion, forty-three million, four hundred two thousand, three hundred fifteen".