1320221210221 has 4 divisors (see below), whose sum is σ = 1320439542912. Its totient is φ = 1320002877532.

The previous prime is 1320221210219. The next prime is 1320221210233. The reversal of 1320221210221 is 1220121220231.

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 1320221210221 - 2¹ = 1320221210219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320221210291) 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, 109157275 + ... + 109169368.

It is an arithmetic number, because the mean of its divisors is an integer number (330109885728).

Almost surely, 2^{1320221210221} is an apocalyptic number.

It is an amenable number.

1320221210221 is a deficient number, since it is larger than the sum of its proper divisors (218332691).

1320221210221 is an equidigital number, since it uses as much as digits as its factorization.

1320221210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218332690.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1320221210221 its reverse (1220121220231), we get a palindrome (2540342430452).

The spelling of 1320221210221 in words is "one trillion, three hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".