21504522203 has 4 divisors (see below), whose sum is σ = 21641493840. Its totient is φ = 21367550568.

The previous prime is 21504522191. The next prime is 21504522233. The reversal of 21504522203 is 30222540512.

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 21504522203 - 2⁴ = 21504522187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21504522233) by changing a digit.

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, 68485583 + ... + 68485896.

It is an arithmetic number, because the mean of its divisors is an integer number (5410373460).

Almost surely, 2^21504522203 is an apocalyptic number.

21504522203 is a deficient number, since it is larger than the sum of its proper divisors (136971637).

21504522203 is a wasteful number, since it uses less digits than its factorization.

21504522203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136971636.

The product of its (nonzero) digits is 4800, while the sum is 26.

The spelling of 21504522203 in words is "twenty-one billion, five hundred four million, five hundred twenty-two thousand, two hundred three".