21043533435 has 16 divisors (see below), whose sum is σ = 33671473440. Its totient is φ = 11222611200.

The previous prime is 21043533431. The next prime is 21043533613. The reversal of 21043533435 is 53433534012.

It is not a de Polignac number, because 21043533435 - 2² = 21043533431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043533396 and 21043533405.

It is not an unprimeable number, because it can be changed into a prime (21043533431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458535 + ... + 502335.

It is an arithmetic number, because the mean of its divisors is an integer number (2104467090).

Almost surely, 2^21043533435 is an apocalyptic number.

21043533435 is a deficient number, since it is larger than the sum of its proper divisors (12627940005).

21043533435 is a wasteful number, since it uses less digits than its factorization.

21043533435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75838.

The product of its (nonzero) digits is 64800, while the sum is 33.

The spelling of 21043533435 in words is "twenty-one billion, forty-three million, five hundred thirty-three thousand, four hundred thirty-five".