201021110101221 has 8 divisors (see below), whose sum is σ = 269633105765184. Its totient is φ = 133211593919040.

The previous prime is 201021110101213. The next prime is 201021110101271. The reversal of 201021110101221 is 122101011120102.

It is a happy number.

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

It is not a de Polignac number, because 201021110101221 - 2³ = 201021110101213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201021110101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021110101271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200619869860 + ... + 200619870861.

It is an arithmetic number, because the mean of its divisors is an integer number (33704138220648).

Almost surely, 2^{201021110101221} is an apocalyptic number.

It is an amenable number.

201021110101221 is a deficient number, since it is larger than the sum of its proper divisors (68611995663963).

201021110101221 is a wasteful number, since it uses less digits than its factorization.

201021110101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401239740891.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201021110101221 its reverse (122101011120102), we get a palindrome (323122121221323).

The spelling of 201021110101221 in words is "two hundred one trillion, twenty-one billion, one hundred ten million, one hundred one thousand, two hundred twenty-one".