1320434322221 has 10 divisors (see below), whose sum is σ = 1540415053422. Its totient is φ = 1131800845560.

The previous prime is 1320434322217. The next prime is 1320434322223. The reversal of 1320434322221 is 1222234340231.

It can be written as a sum of positive squares in only one way, i.e., 1315927885321 + 4506436900 = 1147139^2 + 67130^2 .

It is not a de Polignac number, because 1320434322221 - 2² = 1320434322217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320434322223) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 274973510 + ... + 274978311.

Almost surely, 2^{1320434322221} is an apocalyptic number.

It is an amenable number.

1320434322221 is a deficient number, since it is larger than the sum of its proper divisors (219980731201).

1320434322221 is an frugal number, since it uses more digits than its factorization.

1320434322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549951849 (or 549951828 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 1320434322221 its reverse (1222234340231), we get a palindrome (2542668662452).

The spelling of 1320434322221 in words is "one trillion, three hundred twenty billion, four hundred thirty-four million, three hundred twenty-two thousand, two hundred twenty-one".