146821 has 4 divisors (see below), whose sum is σ = 150444. Its totient is φ = 143200.

The previous prime is 146819. The next prime is 146833. The reversal of 146821 is 128641.

146821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128641 = 197 ⋅653.

It can be written as a sum of positive squares in 2 ways, for example, as 65025 + 81796 = 255^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 146821 - 2¹ = 146819 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

146821 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 146792 and 146801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146801) 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, 1750 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (37611).

2¹⁴⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

146821 is a deficient number, since it is larger than the sum of its proper divisors (3623).

146821 is an equidigital number, since it uses as much as digits as its factorization.

146821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622.

The product of its digits is 384, while the sum is 22.

The square root of 146821 is about 383.1722850103. The cubic root of 146821 is about 52.7548904969.

The spelling of 146821 in words is "one hundred forty-six thousand, eight hundred twenty-one".