21042135435 has 8 divisors (see below), whose sum is σ = 33667416720. Its totient is φ = 11222472224.

The previous prime is 21042135403. The next prime is 21042135469. The reversal of 21042135435 is 53453124012.

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 21042135435 - 2⁵ = 21042135403 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701404500 + ... + 701404529.

It is an arithmetic number, because the mean of its divisors is an integer number (4208427090).

Almost surely, 2^21042135435 is an apocalyptic number.

21042135435 is a deficient number, since it is larger than the sum of its proper divisors (12625281285).

21042135435 is a wasteful number, since it uses less digits than its factorization.

21042135435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402809037.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21042135435 its reverse (53453124012), we get a palindrome (74495259447).

The spelling of 21042135435 in words is "twenty-one billion, forty-two million, one hundred thirty-five thousand, four hundred thirty-five".