821941 has 2 divisors, whose sum is σ = 821942. Its totient is φ = 821940.

The previous prime is 821939. The next prime is 821971. The reversal of 821941 is 149128.

It is a happy number.

821941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 2916 = 905^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 821941 - 2¹ = 821939 is a prime.

Together with 821939, it forms a pair of twin primes.

It is an Ulam number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410970 + 410971.

It is an arithmetic number, because the mean of its divisors is an integer number (410971).

2⁸²¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

821941 is a deficient number, since it is larger than the sum of its proper divisors (1).

821941 is an equidigital number, since it uses as much as digits as its factorization.

821941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 821941 is about 906.6096183033. The cubic root of 821941 is about 93.6728099437.

It can be divided in two parts, 8 and 21941, that multiplied together give a triangular number (175528 = T₅₉₂).

The spelling of 821941 in words is "eight hundred twenty-one thousand, nine hundred forty-one".