21000200003 has 4 divisors (see below), whose sum is σ = 21063645048. Its totient is φ = 20936754960.

The previous prime is 21000199999. The next prime is 21000200009. The reversal of 21000200003 is 30000200012.

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 21000200003 - 2² = 21000199999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000200009) 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, 31722026 + ... + 31722687.

It is an arithmetic number, because the mean of its divisors is an integer number (5265911262).

Almost surely, 2^21000200003 is an apocalyptic number.

21000200003 is a deficient number, since it is larger than the sum of its proper divisors (63445045).

21000200003 is an equidigital number, since it uses as much as digits as its factorization.

21000200003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63445044.

The product of its (nonzero) digits is 12, while the sum is 8.

Adding to 21000200003 its reverse (30000200012), we get a palindrome (51000400015).

Subtracting 21000200003 from its reverse (30000200012), we obtain a palindrome (9000000009).

The spelling of 21000200003 in words is "twenty-one billion, two hundred thousand, three".