821411 has 2 divisors, whose sum is σ = 821412. Its totient is φ = 821410.

The previous prime is 821383. The next prime is 821441. The reversal of 821411 is 114128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821411 - 2¹⁴ = 805027 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 821411.

It is not a weakly prime, because it can be changed into another prime (821441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410705 + 410706.

It is an arithmetic number, because the mean of its divisors is an integer number (410706).

2⁸²¹⁴¹¹ is an apocalyptic number.

821411 is a deficient number, since it is larger than the sum of its proper divisors (1).

821411 is an equidigital number, since it uses as much as digits as its factorization.

821411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 17.

The square root of 821411 is about 906.3172733651. The cubic root of 821411 is about 93.6526717326.

Adding to 821411 its reverse (114128), we get a palindrome (935539).

It can be divided in two parts, 821 and 411, that multiplied together give a triangular number (337431 = T₈₂₁).

The spelling of 821411 in words is "eight hundred twenty-one thousand, four hundred eleven".