212312121213221 has 2 divisors, whose sum is σ = 212312121213222. Its totient is φ = 212312121213220.

The previous prime is 212312121213209. The next prime is 212312121213277. The reversal of 212312121213221 is 122312121213212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107052421264996 + 105259699948225 = 10346614^2 + 10259615^2 .

It is a cyclic number.

It is not a de Polignac number, because 212312121213221 - 2¹⁴ = 212312121196837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212312121218221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106156060606610 + 106156060606611.

It is an arithmetic number, because the mean of its divisors is an integer number (106156060606611).

Almost surely, 2^{212312121213221} is an apocalyptic number.

It is an amenable number.

212312121213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212312121213221 is an equidigital number, since it uses as much as digits as its factorization.

212312121213221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

Adding to 212312121213221 its reverse (122312121213212), we get a palindrome (334624242426433).

Subtracting from 212312121213221 its reverse (122312121213212), we obtain a palindrome (90000000000009).

The spelling of 212312121213221 in words is "two hundred twelve trillion, three hundred twelve billion, one hundred twenty-one million, two hundred thirteen thousand, two hundred twenty-one".