1355130221 has 4 divisors (see below), whose sum is σ = 1355333052. Its totient is φ = 1354927392.

The previous prime is 1355130199. The next prime is 1355130229. The reversal of 1355130221 is 1220315531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 630712996 + 724417225 = 25114^2 + 26915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355130221 - 2³⁰ = 281388397 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 (1355130229) 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, 91040 + ... + 104873.

It is an arithmetic number, because the mean of its divisors is an integer number (338833263).

Almost surely, 2^1355130221 is an apocalyptic number.

It is an amenable number.

1355130221 is a deficient number, since it is larger than the sum of its proper divisors (202831).

1355130221 is an equidigital number, since it uses as much as digits as its factorization.

1355130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202830.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1355130221 is about 36812.0934069227. The cubic root of 1355130221 is about 1106.6076722052.

Adding to 1355130221 its reverse (1220315531), we get a palindrome (2575445752).

The spelling of 1355130221 in words is "one billion, three hundred fifty-five million, one hundred thirty thousand, two hundred twenty-one".