201021221222111 has 16 divisors (see below), whose sum is σ = 207294646363488. Its totient is φ = 194871580992000.

The previous prime is 201021221222027. The next prime is 201021221222113. The reversal of 201021221222111 is 111222122120102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021221222111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021221222113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98495405 + ... + 100515606.

It is an arithmetic number, because the mean of its divisors is an integer number (12955915397718).

Almost surely, 2^{201021221222111} is an apocalyptic number.

201021221222111 is a deficient number, since it is larger than the sum of its proper divisors (6273425141377).

201021221222111 is a wasteful number, since it uses less digits than its factorization.

201021221222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199011322.

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

Adding to 201021221222111 its reverse (111222122120102), we get a palindrome (312243343342213).

The spelling of 201021221222111 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".