21201020201 has 8 divisors (see below), whose sum is σ = 22129588800. Its totient is φ = 20273017072.

The previous prime is 21201020189. The next prime is 21201020251. The reversal of 21201020201 is 10202010212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201020201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201020251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63830 + ... + 215583.

It is an arithmetic number, because the mean of its divisors is an integer number (2766198600).

Almost surely, 2^21201020201 is an apocalyptic number.

It is an amenable number.

21201020201 is a deficient number, since it is larger than the sum of its proper divisors (928568599).

21201020201 is a wasteful number, since it uses less digits than its factorization.

21201020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282735.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201020201 its reverse (10202010212), we get a palindrome (31403030413).

The spelling of 21201020201 in words is "twenty-one billion, two hundred one million, twenty thousand, two hundred one".