1355253221 has 6 divisors (see below), whose sum is σ = 1576519110. Its totient is φ = 1161645576.

The previous prime is 1355253199. The next prime is 1355253227. The reversal of 1355253221 is 1223525531.

It can be written as a sum of positive squares in only one way, i.e., 1337730625 + 17522596 = 36575^2 + 4186^2 .

It is not a de Polignac number, because 1355253221 - 2³⁰ = 281511397 is a prime.

It is a super-2 number, since 2×1355253221² = 3673422586061749682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355253227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13829066 + ... + 13829163.

It is an arithmetic number, because the mean of its divisors is an integer number (262753185).

Almost surely, 2^1355253221 is an apocalyptic number.

It is an amenable number.

1355253221 is a deficient number, since it is larger than the sum of its proper divisors (221265889).

1355253221 is an equidigital number, since it uses as much as digits as its factorization.

1355253221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27658243 (or 27658236 counting only the distinct ones).

The product of its digits is 9000, while the sum is 29.

The square root of 1355253221 is about 36813.7640156505. The cubic root of 1355253221 is about 1106.6411520444.

Adding to 1355253221 its reverse (1223525531), we get a palindrome (2578778752).

The spelling of 1355253221 in words is "one billion, three hundred fifty-five million, two hundred fifty-three thousand, two hundred twenty-one".