21555005433503 has 8 divisors (see below), whose sum is σ = 22146910046640. Its totient is φ = 20963592236160.

The previous prime is 21555005433497. The next prime is 21555005433607. The reversal of 21555005433503 is 30533450055512.

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 21555005433503 - 2¹² = 21555005429407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21555005433103) 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, 122765018 + ... + 122940471.

It is an arithmetic number, because the mean of its divisors is an integer number (2768363755830).

Almost surely, 2^{21555005433503} is an apocalyptic number.

21555005433503 is a deficient number, since it is larger than the sum of its proper divisors (591904613137).

21555005433503 is a wasteful number, since it uses less digits than its factorization.

21555005433503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245707897.

The product of its (nonzero) digits is 675000, while the sum is 41.

The spelling of 21555005433503 in words is "twenty-one trillion, five hundred fifty-five billion, five million, four hundred thirty-three thousand, five hundred three".