21010000201 has 4 divisors (see below), whose sum is σ = 21010805712. Its totient is φ = 21009194692.

The previous prime is 21010000199. The next prime is 21010000217. The reversal of 21010000201 is 10200001012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21010000201 - 2¹ = 21010000199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010000261) 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, 362275 + ... + 416248.

It is an arithmetic number, because the mean of its divisors is an integer number (5252701428).

Almost surely, 2^21010000201 is an apocalyptic number.

It is an amenable number.

21010000201 is a deficient number, since it is larger than the sum of its proper divisors (805511).

21010000201 is an equidigital number, since it uses as much as digits as its factorization.

21010000201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805510.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21010000201 its reverse (10200001012), we get a palindrome (31210001213).

The spelling of 21010000201 in words is "twenty-one billion, ten million, two hundred one", and thus it is an aban number.