141821 has 4 divisors (see below), whose sum is σ = 145692. Its totient is φ = 137952.

The previous prime is 141811. The next prime is 141829. The reversal of 141821 is 128141.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128141 = 13 ⋅9857.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 60025 = 286^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 141821 - 2¹⁰ = 140797 is a prime.

It is a super-2 number, since 2×141821² = 40226392082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 141821.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 141821.

It is not an unprimeable number, because it can be changed into a prime (141829) 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, 1880 + ... + 1953.

It is an arithmetic number, because the mean of its divisors is an integer number (36423).

2¹⁴¹⁸²¹ is an apocalyptic number.

It is an amenable number.

141821 is a deficient number, since it is larger than the sum of its proper divisors (3871).

141821 is an equidigital number, since it uses as much as digits as its factorization.

141821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870.

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

The square root of 141821 is about 376.5912903932. The cubic root of 141821 is about 52.1491036133.

Adding to 141821 its reverse (128141), we get a palindrome (269962).

The spelling of 141821 in words is "one hundred forty-one thousand, eight hundred twenty-one".