355021 has 4 divisors (see below), whose sum is σ = 359100. Its totient is φ = 350944.

The previous prime is 355009. The next prime is 355027. The reversal of 355021 is 120553.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120553 = 29 ⋅4157.

It can be written as a sum of positive squares in 2 ways, for example, as 114921 + 240100 = 339^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 355021 - 2¹¹ = 352973 is a prime.

It is a Duffinian number.

355021 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 354986 and 355004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355027) 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, 1906 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (89775).

2³⁵⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

355021 is a deficient number, since it is larger than the sum of its proper divisors (4079).

355021 is an equidigital number, since it uses as much as digits as its factorization.

355021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4078.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 355021 is about 595.8363869386. The cubic root of 355021 is about 70.8083836774.

Adding to 355021 its reverse (120553), we get a palindrome (475574).

The spelling of 355021 in words is "three hundred fifty-five thousand, twenty-one".