201222111202121 has 4 divisors (see below), whose sum is σ = 204520834336644. Its totient is φ = 197923388067600.

The previous prime is 201222111202109. The next prime is 201222111202127. The reversal of 201222111202121 is 121202111222102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91287725000521 + 109934386201600 = 9554461^2 + 10484960^2 .

It is a cyclic number.

It is not a de Polignac number, because 201222111202121 - 2¹⁸ = 201222110939977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201222111202093 and 201222111202102.

It is not an unprimeable number, because it can be changed into a prime (201222111202127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649361567170 + ... + 1649361567291.

It is an arithmetic number, because the mean of its divisors is an integer number (51130208584161).

Almost surely, 2^{201222111202121} is an apocalyptic number.

It is an amenable number.

201222111202121 is a deficient number, since it is larger than the sum of its proper divisors (3298723134523).

201222111202121 is an equidigital number, since it uses as much as digits as its factorization.

201222111202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298723134522.

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

Adding to 201222111202121 its reverse (121202111222102), we get a palindrome (322424222424223).

The spelling of 201222111202121 in words is "two hundred one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred two thousand, one hundred twenty-one".