21204332242535 has 8 divisors (see below), whose sum is σ = 27402521667360. Its totient is φ = 15658583809824.

The previous prime is 21204332242519. The next prime is 21204332242537. The reversal of 21204332242535 is 53524223340212.

It is a happy number.

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 21204332242535 - 2⁴ = 21204332242519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204332242537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163110247955 + ... + 163110248084.

It is an arithmetic number, because the mean of its divisors is an integer number (3425315208420).

Almost surely, 2^{21204332242535} is an apocalyptic number.

21204332242535 is a deficient number, since it is larger than the sum of its proper divisors (6198189424825).

21204332242535 is a wasteful number, since it uses less digits than its factorization.

21204332242535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326220496057.

The product of its (nonzero) digits is 345600, while the sum is 38.

Adding to 21204332242535 its reverse (53524223340212), we get a palindrome (74728555582747).

The spelling of 21204332242535 in words is "twenty-one trillion, two hundred four billion, three hundred thirty-two million, two hundred forty-two thousand, five hundred thirty-five".