336821 has 4 divisors (see below), whose sum is σ = 356652. Its totient is φ = 316992.

The previous prime is 336803. The next prime is 336823. The reversal of 336821 is 128633.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128633 = 307 ⋅419.

It can be written as a sum of positive squares in 2 ways, for example, as 96721 + 240100 = 311^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 336821 - 2⁶ = 336757 is a prime.

It is a super-2 number, since 2×336821² = 226896772082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

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 336821.

It is not an unprimeable number, because it can be changed into a prime (336823) 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, 9890 + ... + 9923.

It is an arithmetic number, because the mean of its divisors is an integer number (89163).

2³³⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

336821 is a deficient number, since it is larger than the sum of its proper divisors (19831).

336821 is a wasteful number, since it uses less digits than its factorization.

336821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19830.

The product of its digits is 864, while the sum is 23.

The square root of 336821 is about 580.3628175547. The cubic root of 336821 is about 69.5771102119.

The spelling of 336821 in words is "three hundred thirty-six thousand, eight hundred twenty-one".