356021 has 4 divisors (see below), whose sum is σ = 360972. Its totient is φ = 351072.

The previous prime is 355969. The next prime is 356023. The reversal of 356021 is 120653.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120653 = 13 ⋅9281.

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 207025 = 386^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 356021 - 2¹⁰ = 354997 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 (356023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2366 + ... + 2511.

It is an arithmetic number, because the mean of its divisors is an integer number (90243).

2³⁵⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

356021 is a deficient number, since it is larger than the sum of its proper divisors (4951).

356021 is an equidigital number, since it uses as much as digits as its factorization.

356021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 356021 is about 596.6749533875. The cubic root of 356021 is about 70.8748041659.

Adding to 356021 its reverse (120653), we get a palindrome (476674).

The spelling of 356021 in words is "three hundred fifty-six thousand, twenty-one".