212223211220321 has 4 divisors (see below), whose sum is σ = 242540812823232. Its totient is φ = 181905609617412.

The previous prime is 212223211220297. The next prime is 212223211220329. The reversal of 212223211220321 is 123022112322212.

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 a de Polignac number, because none of the positive numbers 2^k-212223211220321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212223211220329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15158800801445 + ... + 15158800801458.

It is an arithmetic number, because the mean of its divisors is an integer number (60635203205808).

Almost surely, 2^{212223211220321} is an apocalyptic number.

It is an amenable number.

212223211220321 is a deficient number, since it is larger than the sum of its proper divisors (30317601602911).

212223211220321 is an equidigital number, since it uses as much as digits as its factorization.

212223211220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30317601602910.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 212223211220321 its reverse (123022112322212), we get a palindrome (335245323542533).

The spelling of 212223211220321 in words is "two hundred twelve trillion, two hundred twenty-three billion, two hundred eleven million, two hundred twenty thousand, three hundred twenty-one".