355135221 has 12 divisors (see below), whose sum is σ = 586255072. Its totient is φ = 202934376.

The previous prime is 355135177. The next prime is 355135223. The reversal of 355135221 is 122531553.

It is a happy number.

It is not a de Polignac number, because 355135221 - 2¹³ = 355127029 is a prime.

It is a super-2 number, since 2×355135221² = 252242050389437682, 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 (355135223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2818471 + ... + 2818596.

Almost surely, 2^355135221 is an apocalyptic number.

It is an amenable number.

355135221 is a deficient number, since it is larger than the sum of its proper divisors (231119851).

355135221 is a wasteful number, since it uses less digits than its factorization.

355135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637080 (or 5637077 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 355135221 is about 18845.0317325283. The cubic root of 355135221 is about 708.1597659653.

Adding to 355135221 its reverse (122531553), we get a palindrome (477666774).

The spelling of 355135221 in words is "three hundred fifty-five million, one hundred thirty-five thousand, two hundred twenty-one".