126213 has 4 divisors (see below), whose sum is σ = 168288. Its totient is φ = 84140.

The previous prime is 126211. The next prime is 126223. The reversal of 126213 is 312621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 312621 = 3 ⋅104207.

It is a cyclic number.

It is not a de Polignac number, because 126213 - 2¹ = 126211 is a prime.

It is a D-number.

126213 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 126192 and 126201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126211) 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, 21033 + ... + 21038.

It is an arithmetic number, because the mean of its divisors is an integer number (42072).

2¹²⁶²¹³ is an apocalyptic number.

It is an amenable number.

126213 is a deficient number, since it is larger than the sum of its proper divisors (42075).

126213 is an equidigital number, since it uses as much as digits as its factorization.

126213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42074.

The product of its digits is 72, while the sum is 15.

The square root of 126213 is about 355.2646900552. The cubic root of 126213 is about 50.1612129822.

Adding to 126213 its reverse (312621), we get a palindrome (438834).

It can be divided in two parts, 1262 and 13, that added together give a triangular number (1275 = T₅₀).

The spelling of 126213 in words is "one hundred twenty-six thousand, two hundred thirteen".