212221111200121 has 4 divisors (see below), whose sum is σ = 212221776208000. Its totient is φ = 212220446192244.

The previous prime is 212221111200061. The next prime is 212221111200209. The reversal of 212221111200121 is 121002111122212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212221111200121 - 2¹⁵ = 212221111167353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212221111200221) 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, 332025021 + ... + 332663578.

It is an arithmetic number, because the mean of its divisors is an integer number (53055444052000).

Almost surely, 2^{212221111200121} is an apocalyptic number.

It is an amenable number.

212221111200121 is a deficient number, since it is larger than the sum of its proper divisors (665007879).

212221111200121 is an equidigital number, since it uses as much as digits as its factorization.

212221111200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665007878.

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

Adding to 212221111200121 its reverse (121002111122212), we get a palindrome (333223222322333).

The spelling of 212221111200121 in words is "two hundred twelve trillion, two hundred twenty-one billion, one hundred eleven million, two hundred thousand, one hundred twenty-one".