201021022110221 has 4 divisors (see below), whose sum is σ = 201034653441312. Its totient is φ = 201007390779132.

The previous prime is 201021022110173. The next prime is 201021022110247. The reversal of 201021022110221 is 122011220120102.

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 201021022110221 - 2⁶ = 201021022110157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201021022110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021022100221) 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, 6815643425 + ... + 6815672918.

It is an arithmetic number, because the mean of its divisors is an integer number (50258663360328).

Almost surely, 2^{201021022110221} is an apocalyptic number.

It is an amenable number.

201021022110221 is a deficient number, since it is larger than the sum of its proper divisors (13631331091).

201021022110221 is a wasteful number, since it uses less digits than its factorization.

201021022110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13631331090.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201021022110221 its reverse (122011220120102), we get a palindrome (323032242230323).

The spelling of 201021022110221 in words is "two hundred one trillion, twenty-one billion, twenty-two million, one hundred ten thousand, two hundred twenty-one".