21152105435 has 4 divisors (see below), whose sum is σ = 25382526528. Its totient is φ = 16921684344.

The previous prime is 21152105419. The next prime is 21152105453. The reversal of 21152105435 is 53450125112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21152105435 - 2⁴ = 21152105419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21152105398 and 21152105407.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2115210539 + ... + 2115210548.

It is an arithmetic number, because the mean of its divisors is an integer number (6345631632).

Almost surely, 2^21152105435 is an apocalyptic number.

21152105435 is a deficient number, since it is larger than the sum of its proper divisors (4230421093).

21152105435 is an equidigital number, since it uses as much as digits as its factorization.

21152105435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230421092.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 21152105435 in words is "twenty-one billion, one hundred fifty-two million, one hundred five thousand, four hundred thirty-five".