51213 has 8 divisors (see below), whose sum is σ = 70048. Its totient is φ = 33264.

The previous prime is 51203. The next prime is 51217. The reversal of 51213 is 31215.

51213 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51213 - 2⁴ = 51197 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70 + ... + 327.

It is an arithmetic number, because the mean of its divisors is an integer number (8756).

2⁵¹²¹³ is an apocalyptic number.

It is an amenable number.

51213 is a deficient number, since it is larger than the sum of its proper divisors (18835).

51213 is a wasteful number, since it uses less digits than its factorization.

51213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443.

The product of its digits is 30, while the sum is 12.

The square root of 51213 is about 226.3028943695. The cubic root of 51213 is about 37.1358531454.

Adding to 51213 its reverse (31215), we get a palindrome (82428).

It can be divided in two parts, 512 and 13, that added together give a palindrome (525).

The spelling of 51213 in words is "fifty-one thousand, two hundred thirteen".