355123221 has 4 divisors (see below), whose sum is σ = 473497632. Its totient is φ = 236748812.

The previous prime is 355123207. The next prime is 355123231. The reversal of 355123221 is 122321553.

It is a happy number.

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 355123221 - 2⁵ = 355123189 is a prime.

It is a super-2 number, since 2×355123221² = 252225004186829682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 355123191 and 355123200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355123201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59187201 + ... + 59187206.

It is an arithmetic number, because the mean of its divisors is an integer number (118374408).

Almost surely, 2^355123221 is an apocalyptic number.

It is an amenable number.

355123221 is a deficient number, since it is larger than the sum of its proper divisors (118374411).

355123221 is a wasteful number, since it uses less digits than its factorization.

355123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118374410.

The product of its digits is 1800, while the sum is 24.

The square root of 355123221 is about 18844.7133435348. The cubic root of 355123221 is about 708.1517896487.

Adding to 355123221 its reverse (122321553), we get a palindrome (477444774).

The spelling of 355123221 in words is "three hundred fifty-five million, one hundred twenty-three thousand, two hundred twenty-one".