21044513203 has 8 divisors (see below), whose sum is σ = 24052267008. Its totient is φ = 18037108104.

The previous prime is 21044513141. The next prime is 21044513239. The reversal of 21044513203 is 30231544012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044513203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21044513263) 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 7 ways as a sum of consecutive naturals, for example, 58350 + ... + 213292.

It is an arithmetic number, because the mean of its divisors is an integer number (3006533376).

Almost surely, 2^21044513203 is an apocalyptic number.

21044513203 is a deficient number, since it is larger than the sum of its proper divisors (3007753805).

21044513203 is a wasteful number, since it uses less digits than its factorization.

21044513203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174353.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21044513203 in words is "twenty-one billion, forty-four million, five hundred thirteen thousand, two hundred three".