212221102210121 has 8 divisors (see below), whose sum is σ = 217608987446664. Its totient is φ = 206894792805120.

The previous prime is 212221102210097. The next prime is 212221102210133. The reversal of 212221102210121 is 121012201122212.

It can be written as a sum of positive squares in 4 ways, for example, as 57989937721 + 212163112272400 = 240811^2 + 14565820^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212221102210121 - 2³⁰ = 212220028468297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212221102210093 and 212221102210102.

It is not an unprimeable number, because it can be changed into a prime (212221102210181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15393950906 + ... + 15393964691.

It is an arithmetic number, because the mean of its divisors is an integer number (27201123430833).

Almost surely, 2^{212221102210121} is an apocalyptic number.

It is an amenable number.

212221102210121 is a deficient number, since it is larger than the sum of its proper divisors (5387885236543).

212221102210121 is a wasteful number, since it uses less digits than its factorization.

212221102210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30787915771.

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

Adding to 212221102210121 its reverse (121012201122212), we get a palindrome (333233303332333).

The spelling of 212221102210121 in words is "two hundred twelve trillion, two hundred twenty-one billion, one hundred two million, two hundred ten thousand, one hundred twenty-one".