201100122221 has 8 divisors (see below), whose sum is σ = 212189560800. Its totient is φ = 190061205840.

The previous prime is 201100122163. The next prime is 201100122229. The reversal of 201100122221 is 122221001102.

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

It is not a de Polignac number, because 201100122221 - 2¹⁰ = 201100121197 is a prime.

It is a super-2 number, since 2×201100122221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201100122196 and 201100122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201100122229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12622370 + ... + 12638291.

It is an arithmetic number, because the mean of its divisors is an integer number (26523695100).

Almost surely, 2^201100122221 is an apocalyptic number.

It is an amenable number.

201100122221 is a deficient number, since it is larger than the sum of its proper divisors (11089438579).

201100122221 is a wasteful number, since it uses less digits than its factorization.

201100122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25261099.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201100122221 its reverse (122221001102), we get a palindrome (323321123323).

The spelling of 201100122221 in words is "two hundred one billion, one hundred million, one hundred twenty-two thousand, two hundred twenty-one".