201100211201221 has 4 divisors (see below), whose sum is σ = 201247321817952. Its totient is φ = 200953100584492.

The previous prime is 201100211201207. The next prime is 201100211201377. The reversal of 201100211201221 is 122102112001102.

201100211201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 201100211201221 - 2²⁷ = 201100076983493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201100211201195 and 201100211201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201100211231221) 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, 73555306315 + ... + 73555309048.

It is an arithmetic number, because the mean of its divisors is an integer number (50311830454488).

Almost surely, 2^{201100211201221} is an apocalyptic number.

It is an amenable number.

201100211201221 is a deficient number, since it is larger than the sum of its proper divisors (147110616731).

201100211201221 is a wasteful number, since it uses less digits than its factorization.

201100211201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147110616730.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201100211201221 its reverse (122102112001102), we get a palindrome (323202323202323).

The spelling of 201100211201221 in words is "two hundred one trillion, one hundred billion, two hundred eleven million, two hundred one thousand, two hundred twenty-one".