21043534115 has 8 divisors (see below), whose sum is σ = 25445006928. Its totient is φ = 16706316640.

The previous prime is 21043534091. The next prime is 21043534121. The reversal of 21043534115 is 51143534012.

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

It is not a de Polignac number, because 21043534115 - 2¹⁴ = 21043517731 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 16063112 + ... + 16064421.

It is an arithmetic number, because the mean of its divisors is an integer number (3180625866).

Almost surely, 2^21043534115 is an apocalyptic number.

21043534115 is a deficient number, since it is larger than the sum of its proper divisors (4401472813).

21043534115 is a wasteful number, since it uses less digits than its factorization.

21043534115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32127669.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21043534115 in words is "twenty-one billion, forty-three million, five hundred thirty-four thousand, one hundred fifteen".