21043542435 has 16 divisors (see below), whose sum is σ = 35441756160. Its totient is φ = 10632526560.

The previous prime is 21043542427. The next prime is 21043542437. The reversal of 21043542435 is 53424534012.

It is not a de Polignac number, because 21043542435 - 2³ = 21043542427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043542396 and 21043542405.

It is not an unprimeable number, because it can be changed into a prime (21043542437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36918211 + ... + 36918780.

It is an arithmetic number, because the mean of its divisors is an integer number (2215109760).

Almost surely, 2^21043542435 is an apocalyptic number.

21043542435 is a deficient number, since it is larger than the sum of its proper divisors (14398213725).

21043542435 is a wasteful number, since it uses less digits than its factorization.

21043542435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73837018.

The product of its (nonzero) digits is 57600, while the sum is 33.

The spelling of 21043542435 in words is "twenty-one billion, forty-three million, five hundred forty-two thousand, four hundred thirty-five".