21071027203 has 4 divisors (see below), whose sum is σ = 21468593808. Its totient is φ = 20673460600.

The previous prime is 21071027183. The next prime is 21071027231. The reversal of 21071027203 is 30272017012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21071027203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21071027273) 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, 198783223 + ... + 198783328.

It is an arithmetic number, because the mean of its divisors is an integer number (5367148452).

Almost surely, 2^21071027203 is an apocalyptic number.

21071027203 is a deficient number, since it is larger than the sum of its proper divisors (397566605).

21071027203 is an equidigital number, since it uses as much as digits as its factorization.

21071027203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397566604.

The product of its (nonzero) digits is 1176, while the sum is 25.

The spelling of 21071027203 in words is "twenty-one billion, seventy-one million, twenty-seven thousand, two hundred three".