21243602203 has 16 divisors (see below), whose sum is σ = 23563440000. Its totient is φ = 19060134912.

The previous prime is 21243602189. The next prime is 21243602209. The reversal of 21243602203 is 30220634212.

It is a cyclic number.

It is not a de Polignac number, because 21243602203 - 2¹³ = 21243594011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21243602209) 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 15 ways as a sum of consecutive naturals, for example, 233778 + ... + 311671.

It is an arithmetic number, because the mean of its divisors is an integer number (1472715000).

Almost surely, 2^21243602203 is an apocalyptic number.

21243602203 is a deficient number, since it is larger than the sum of its proper divisors (2319837797).

21243602203 is a wasteful number, since it uses less digits than its factorization.

21243602203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545574.

The product of its (nonzero) digits is 3456, while the sum is 25.

The spelling of 21243602203 in words is "twenty-one billion, two hundred forty-three million, six hundred two thousand, two hundred three".