212221222001221 has 4 divisors (see below), whose sum is σ = 221448231653472. Its totient is φ = 202994212348972.

The previous prime is 212221222001207. The next prime is 212221222001231. The reversal of 212221222001221 is 122100222122212.

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 212221222001221 - 2²³ = 212221213612613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212221222001192 and 212221222001201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221222001231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4613504826091 + ... + 4613504826136.

It is an arithmetic number, because the mean of its divisors is an integer number (55362057913368).

Almost surely, 2^{212221222001221} is an apocalyptic number.

It is an amenable number.

212221222001221 is a deficient number, since it is larger than the sum of its proper divisors (9227009652251).

212221222001221 is an equidigital number, since it uses as much as digits as its factorization.

212221222001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9227009652250.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 212221222001221 its reverse (122100222122212), we get a palindrome (334321444123433).

The spelling of 212221222001221 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred twenty-two million, one thousand, two hundred twenty-one".