1321220241 has 20 divisors (see below), whose sum is σ = 2153101104. Its totient is φ = 800739000.

The previous prime is 1321220227. The next prime is 1321220249. The reversal of 1321220241 is 1420221231.

It is a happy number.

It is not a de Polignac number, because 1321220241 - 2¹⁰ = 1321219217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321220249) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 740535 + ... + 742316.

Almost surely, 2^1321220241 is an apocalyptic number.

1321220241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321220241 is a deficient number, since it is larger than the sum of its proper divisors (831880863).

1321220241 is a wasteful number, since it uses less digits than its factorization.

1321220241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482874 (or 1482865 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1321220241 is about 36348.5933840637. The cubic root of 1321220241 is about 1097.2992258686.

Adding to 1321220241 its reverse (1420221231), we get a palindrome (2741441472).

The spelling of 1321220241 in words is "one billion, three hundred twenty-one million, two hundred twenty thousand, two hundred forty-one".