2121213 has 4 divisors (see below), whose sum is σ = 2828288. Its totient is φ = 1414140.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121213 is 3121212.

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 2121213 - 2⁵ = 2121181 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353533 + ... + 353538.

It is an arithmetic number, because the mean of its divisors is an integer number (707072).

2^2121213 is an apocalyptic number.

It is an amenable number.

2121213 is a deficient number, since it is larger than the sum of its proper divisors (707075).

2121213 is an equidigital number, since it uses as much as digits as its factorization.

2121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707074.

The product of its digits is 24, while the sum is 12.

The square root of 2121213 is about 1456.4384641996. The cubic root of 2121213 is about 128.4876620149.

Adding to 2121213 its reverse (3121212), we get a palindrome (5242425).

Subtracting 2121213 from its reverse (3121212), we obtain a palindrome (999999).

The spelling of 2121213 in words is "two million, one hundred twenty-one thousand, two hundred thirteen".