213221204321 has 4 divisors (see below), whose sum is σ = 213559114944. Its totient is φ = 212883293700.

The previous prime is 213221204299. The next prime is 213221204327. The reversal of 213221204321 is 123402122312.

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 213221204321 - 2³⁴ = 196041335137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213221204327) 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, 168954365 + ... + 168955626.

It is an arithmetic number, because the mean of its divisors is an integer number (53389778736).

Almost surely, 2^213221204321 is an apocalyptic number.

It is an amenable number.

213221204321 is a deficient number, since it is larger than the sum of its proper divisors (337910623).

213221204321 is an equidigital number, since it uses as much as digits as its factorization.

213221204321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337910622.

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

Adding to 213221204321 its reverse (123402122312), we get a palindrome (336623326633).

The spelling of 213221204321 in words is "two hundred thirteen billion, two hundred twenty-one million, two hundred four thousand, three hundred twenty-one".