21210022003 has 4 divisors (see below), whose sum is σ = 21238723720. Its totient is φ = 21181320288.

The previous prime is 21210021983. The next prime is 21210022013. The reversal of 21210022003 is 30022001212.

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-21210022003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210022013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14349750 + ... + 14351227.

It is an arithmetic number, because the mean of its divisors is an integer number (5309680930).

Almost surely, 2^21210022003 is an apocalyptic number.

21210022003 is a deficient number, since it is larger than the sum of its proper divisors (28701717).

21210022003 is an equidigital number, since it uses as much as digits as its factorization.

21210022003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28701716.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21210022003 its reverse (30022001212), we get a palindrome (51232023215).

The spelling of 21210022003 in words is "twenty-one billion, two hundred ten million, twenty-two thousand, three".