212221200121 has 16 divisors (see below), whose sum is σ = 248274699904. Its totient is φ = 177605011584.

The previous prime is 212221200097. The next prime is 212221200137. The reversal of 212221200121 is 121002122212.

It is a happy number.

It is not a de Polignac number, because 212221200121 - 2⁵ = 212221200089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212221200095 and 212221200104.

It is not an unprimeable number, because it can be changed into a prime (212221200161) 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, 653011 + ... + 922423.

It is an arithmetic number, because the mean of its divisors is an integer number (15517168744).

Almost surely, 2^212221200121 is an apocalyptic number.

It is an amenable number.

212221200121 is a deficient number, since it is larger than the sum of its proper divisors (36053499783).

212221200121 is a wasteful number, since it uses less digits than its factorization.

212221200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272080.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212221200121 its reverse (121002122212), we get a palindrome (333223322333).

The spelling of 212221200121 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".