212201112210121 has 4 divisors (see below), whose sum is σ = 212399616525700. Its totient is φ = 212002607894544.

The previous prime is 212201112210103. The next prime is 212201112210173. The reversal of 212201112210121 is 121012211102212.

It is a happy number.

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 73423288050121 + 138777824160000 = 8568739^2 + 11780400^2 .

It is a cyclic number.

It is not a de Polignac number, because 212201112210121 - 2⁵ = 212201112210089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212201119210121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99252156186 + ... + 99252158323.

It is an arithmetic number, because the mean of its divisors is an integer number (53099904131425).

Almost surely, 2^{212201112210121} is an apocalyptic number.

It is an amenable number.

212201112210121 is a deficient number, since it is larger than the sum of its proper divisors (198504315579).

212201112210121 is a wasteful number, since it uses less digits than its factorization.

212201112210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198504315578.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212201112210121 its reverse (121012211102212), we get a palindrome (333213323312333).

The spelling of 212201112210121 in words is "two hundred twelve trillion, two hundred one billion, one hundred twelve million, two hundred ten thousand, one hundred twenty-one".