212201211221221 has 4 divisors (see below), whose sum is σ = 212201247127744. Its totient is φ = 212201175314700.

The previous prime is 212201211221179. The next prime is 212201211221243. The reversal of 212201211221221 is 122122112102212.

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 212201211221221 - 2⁷ = 212201211221093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212201211221192 and 212201211221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201211221621) 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, 6763965 + ... + 21683026.

It is an arithmetic number, because the mean of its divisors is an integer number (53050311781936).

Almost surely, 2^{212201211221221} is an apocalyptic number.

It is an amenable number.

212201211221221 is a deficient number, since it is larger than the sum of its proper divisors (35906523).

212201211221221 is an equidigital number, since it uses as much as digits as its factorization.

212201211221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35906522.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 212201211221221 its reverse (122122112102212), we get a palindrome (334323323323433).

The spelling of 212201211221221 in words is "two hundred twelve trillion, two hundred one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".