1331003221 has 4 divisors (see below), whose sum is σ = 1335914944. Its totient is φ = 1326091500.

The previous prime is 1331003207. The next prime is 1331003237. The reversal of 1331003221 is 1223001331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1223001331 = 28019 ⋅43649.

It is a cyclic number.

It is not a de Polignac number, because 1331003221 - 2¹¹ = 1331001173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331003195 and 1331003204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331003021) 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, 2455455 + ... + 2455996.

It is an arithmetic number, because the mean of its divisors is an integer number (333978736).

Almost surely, 2^1331003221 is an apocalyptic number.

It is an amenable number.

1331003221 is a deficient number, since it is larger than the sum of its proper divisors (4911723).

1331003221 is an equidigital number, since it uses as much as digits as its factorization.

1331003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4911722.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1331003221 is about 36482.9168378845. The cubic root of 1331003221 is about 1100.0008873271. Note that the first 3 decimals are identical.

Adding to 1331003221 its reverse (1223001331), we get a palindrome (2554004552).

The spelling of 1331003221 in words is "one billion, three hundred thirty-one million, three thousand, two hundred twenty-one".