1331130221 has 4 divisors (see below), whose sum is σ = 1389005472. Its totient is φ = 1273254972.

The previous prime is 1331130187. The next prime is 1331130239. The reversal of 1331130221 is 1220311331.

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 1331130221 - 2²² = 1326935917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331130121) 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, 28937591 + ... + 28937636.

It is an arithmetic number, because the mean of its divisors is an integer number (347251368).

Almost surely, 2^1331130221 is an apocalyptic number.

It is an amenable number.

1331130221 is a deficient number, since it is larger than the sum of its proper divisors (57875251).

1331130221 is an equidigital number, since it uses as much as digits as its factorization.

1331130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57875250.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1331130221 is about 36484.6573370232. The cubic root of 1331130221 is about 1100.0358723839.

Adding to 1331130221 its reverse (1220311331), we get a palindrome (2551441552).

The spelling of 1331130221 in words is "one billion, three hundred thirty-one million, one hundred thirty thousand, two hundred twenty-one".