212240312321 has 4 divisors (see below), whose sum is σ = 212759237700. Its totient is φ = 211721386944.

The previous prime is 212240312279. The next prime is 212240312353. The reversal of 212240312321 is 123213042212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122982774721 + 89257537600 = 350689^2 + 298760^2 .

It is a cyclic number.

It is not a de Polignac number, because 212240312321 - 2⁶ = 212240312257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212240312381) 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, 259462076 + ... + 259462893.

It is an arithmetic number, because the mean of its divisors is an integer number (53189809425).

Almost surely, 2^212240312321 is an apocalyptic number.

It is an amenable number.

212240312321 is a deficient number, since it is larger than the sum of its proper divisors (518925379).

212240312321 is an equidigital number, since it uses as much as digits as its factorization.

212240312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518925378.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 212240312321 its reverse (123213042212), we get a palindrome (335453354533).

The spelling of 212240312321 in words is "two hundred twelve billion, two hundred forty million, three hundred twelve thousand, three hundred twenty-one".