201222012111221 has 2 divisors, whose sum is σ = 201222012111222. Its totient is φ = 201222012111220.

The previous prime is 201222012111217. The next prime is 201222012111299. The reversal of 201222012111221 is 122111210222102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198042602163121 + 3179409948100 = 14072761^2 + 1783090^2 .

It is a cyclic number.

It is not a de Polignac number, because 201222012111221 - 2² = 201222012111217 is a prime.

It is a super-2 number, since 2×201222012111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201222012111193 and 201222012111202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201212012111221) 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 as a sum of consecutive naturals, namely, 100611006055610 + 100611006055611.

It is an arithmetic number, because the mean of its divisors is an integer number (100611006055611).

Almost surely, 2^{201222012111221} is an apocalyptic number.

It is an amenable number.

201222012111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201222012111221 is an equidigital number, since it uses as much as digits as its factorization.

201222012111221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 201222012111221 its reverse (122111210222102), we get a palindrome (323333222333323).

The spelling of 201222012111221 in words is "two hundred one trillion, two hundred twenty-two billion, twelve million, one hundred eleven thousand, two hundred twenty-one".