21520555332203 has 8 divisors (see below), whose sum is σ = 21525892684800. Its totient is φ = 21515218380648.

The previous prime is 21520555332167. The next prime is 21520555332209. The reversal of 21520555332203 is 30223355502512.

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 21520555332203 - 2¹⁰ = 21520555331179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21520555332209) 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, 126623600 + ... + 126793442.

It is an arithmetic number, because the mean of its divisors is an integer number (2690736585600).

Almost surely, 2^{21520555332203} is an apocalyptic number.

21520555332203 is a deficient number, since it is larger than the sum of its proper divisors (5337352597).

21520555332203 is a wasteful number, since it uses less digits than its factorization.

21520555332203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200521.

The product of its (nonzero) digits is 270000, while the sum is 38.

The spelling of 21520555332203 in words is "twenty-one trillion, five hundred twenty billion, five hundred fifty-five million, three hundred thirty-two thousand, two hundred three".