46821 has 4 divisors (see below), whose sum is σ = 62432. Its totient is φ = 31212.

The previous prime is 46819. The next prime is 46829. The reversal of 46821 is 12864.

Added to its reverse (12864) it gives a triangular number (59685 = T₃₄₅).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 46821 - 2¹ = 46819 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (46829) 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, 7801 + ... + 7806.

It is an arithmetic number, because the mean of its divisors is an integer number (15608).

2⁴⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

46821 is a deficient number, since it is larger than the sum of its proper divisors (15611).

46821 is a wasteful number, since it uses less digits than its factorization.

46821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15610.

The product of its digits is 384, while the sum is 21.

The square root of 46821 is about 216.3816073515. The cubic root of 46821 is about 36.0423883417.

Adding to 46821 its reverse (12864), we get a triangular number (59685 = T₃₄₅).

The spelling of 46821 in words is "forty-six thousand, eight hundred twenty-one".