1330991221 has 8 divisors (see below), whose sum is σ = 1573585920. Its totient is φ = 1101509808.

The previous prime is 1330991219. The next prime is 1330991227. The reversal of 1330991221 is 1221990331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1330991221 - 2¹ = 1330991219 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 (1330991227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3278101 + ... + 3278506.

It is an arithmetic number, because the mean of its divisors is an integer number (196698240).

Almost surely, 2^1330991221 is an apocalyptic number.

It is an amenable number.

1330991221 is a deficient number, since it is larger than the sum of its proper divisors (242594699).

1330991221 is an equidigital number, since it uses as much as digits as its factorization.

1330991221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556643.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 1330991221 is about 36482.7523769795. The cubic root of 1330991221 is about 1099.9975815374.

The spelling of 1330991221 in words is "one billion, three hundred thirty million, nine hundred ninety-one thousand, two hundred twenty-one".