270821 has 2 divisors, whose sum is σ = 270822. Its totient is φ = 270820.

The previous prime is 270799. The next prime is 270833. The reversal of 270821 is 128072.

270821 is nontrivially palindromic in base 6.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172225 + 98596 = 415^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 270821 - 2¹⁴ = 254437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 270793 and 270802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (270841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135410 + 135411.

It is an arithmetic number, because the mean of its divisors is an integer number (135411).

2²⁷⁰⁸²¹ is an apocalyptic number.

It is an amenable number.

270821 is a deficient number, since it is larger than the sum of its proper divisors (1).

270821 is an equidigital number, since it uses as much as digits as its factorization.

270821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 270821 is about 520.4046502482. The cubic root of 270821 is about 64.6984851858.

Adding to 270821 its reverse (128072), we get a palindrome (398893).

The spelling of 270821 in words is "two hundred seventy thousand, eight hundred twenty-one".