21001000200203 has 2 divisors, whose sum is σ = 21001000200204. Its totient is φ = 21001000200202.

The previous prime is 21001000200161. The next prime is 21001000200217. The reversal of 21001000200203 is 30200200010012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001000200203 - 2⁴² = 16602953689099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001000200223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500500100101 + 10500500100102.

It is an arithmetic number, because the mean of its divisors is an integer number (10500500100102).

Almost surely, 2^{21001000200203} is an apocalyptic number.

21001000200203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001000200203 is an equidigital number, since it uses as much as digits as its factorization.

21001000200203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21001000200203 its reverse (30200200010012), we get a palindrome (51201200210215).

The spelling of 21001000200203 in words is "twenty-one trillion, one billion, two hundred thousand, two hundred three".