320000211221 has 4 divisors (see below), whose sum is σ = 320021925312. Its totient is φ = 319978497132.

The previous prime is 320000211197. The next prime is 320000211299. The reversal of 320000211221 is 122112000023.

It is a happy number.

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 320000211221 - 2¹⁰ = 320000210197 is a prime.

It is a super-2 number, since 2×320000211221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 320000211196 and 320000211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320000210221) 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, 10834925 + ... + 10864418.

It is an arithmetic number, because the mean of its divisors is an integer number (80005481328).

Almost surely, 2^320000211221 is an apocalyptic number.

It is an amenable number.

320000211221 is a deficient number, since it is larger than the sum of its proper divisors (21714091).

320000211221 is a wasteful number, since it uses less digits than its factorization.

320000211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21714090.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 320000211221 its reverse (122112000023), we get a palindrome (442112211244).

The spelling of 320000211221 in words is "three hundred twenty billion, two hundred eleven thousand, two hundred twenty-one".