1353612221 has 4 divisors (see below), whose sum is σ = 1457736252. Its totient is φ = 1249488192.

The previous prime is 1353612157. The next prime is 1353612263. The reversal of 1353612221 is 1222163531.

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 931104196 + 422508025 = 30514^2 + 20555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1353612221 - 2⁶ = 1353612157 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 (1353612121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52061996 + ... + 52062021.

It is an arithmetic number, because the mean of its divisors is an integer number (364434063).

Almost surely, 2^1353612221 is an apocalyptic number.

It is an amenable number.

1353612221 is a deficient number, since it is larger than the sum of its proper divisors (104124031).

1353612221 is a wasteful number, since it uses less digits than its factorization.

1353612221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104124030.

The product of its digits is 2160, while the sum is 26.

The square root of 1353612221 is about 36791.4694052847. The cubic root of 1353612221 is about 1106.1943151091.

Adding to 1353612221 its reverse (1222163531), we get a palindrome (2575775752).

The spelling of 1353612221 in words is "one billion, three hundred fifty-three million, six hundred twelve thousand, two hundred twenty-one".