201221202120111 has 48 divisors (see below), whose sum is σ = 324196451036640. Its totient is φ = 119519424460800.

The previous prime is 201221202120041. The next prime is 201221202120139. The reversal of 201221202120111 is 111021202122102.

201221202120111 is a `hidden beast` number, since 201 + 22 + 120 + 212 + 0 + 111 = 666.

201221202120111 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201221202120111 - 2¹¹ = 201221202118063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221202120811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22820430 + ... + 30384443.

It is an arithmetic number, because the mean of its divisors is an integer number (6754092729930).

Almost surely, 2^{201221202120111} is an apocalyptic number.

201221202120111 is a deficient number, since it is larger than the sum of its proper divisors (122975248916529).

201221202120111 is a wasteful number, since it uses less digits than its factorization.

201221202120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53206216 (or 53206213 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 201221202120111 its reverse (111021202122102), we get a palindrome (312242404242213).

The spelling of 201221202120111 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty thousand, one hundred eleven".