2131213 has 4 divisors (see below), whose sum is σ = 2435680.
Its totient is φ = 1826748.
The previous prime is 2131193. The next prime is 2131223. The reversal of 2131213 is 3121312.
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 2131213 - 29 = 2130701 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 2131193 and 2131202.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2131223) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152223 + ... + 152236.
It is an arithmetic number, because the mean of its divisors is an integer number (608920).
22131213 is an apocalyptic number.
It is an amenable number.
2131213 is a deficient number, since it is larger than the sum of its proper divisors (304467).
2131213 is an equidigital number, since it uses as much as digits as its factorization.
2131213 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 304466.
The product of its digits is 36, while the sum is 13.
The square root of 2131213 is about 1459.8674597374.
The cubic root of 2131213 is about 128.6892546572.
Adding to 2131213 its reverse (3121312), we get a palindrome (5252525).
Subtracting 2131213 from its reverse (3121312), we obtain a palindrome (990099).
The spelling of 2131213 in words is "two million, one hundred thirty-one thousand, two hundred thirteen".