201221220221111 has 8 divisors (see below), whose sum is σ = 201533701501440. Its totient is φ = 200908760572408.

The previous prime is 201221220221083. The next prime is 201221220221123. The reversal of 201221220221111 is 111122022122102.

201221220221111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-201221220221111 is a prime.

It is a super-4 number, since 4×201221220221111⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221220221171) 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, 13260890 + ... + 24047736.

It is an arithmetic number, because the mean of its divisors is an integer number (25191712687680).

Almost surely, 2^{201221220221111} is an apocalyptic number.

201221220221111 is a deficient number, since it is larger than the sum of its proper divisors (312481280329).

201221220221111 is a wasteful number, since it uses less digits than its factorization.

201221220221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10815813.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 201221220221111 its reverse (111122022122102), we get a palindrome (312343242343213).

The spelling of 201221220221111 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred eleven".