3721213 has 2 divisors, whose sum is σ = 3721214. Its totient is φ = 3721212.

The previous prime is 3721199. The next prime is 3721217. The reversal of 3721213 is 3121273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3020644 + 700569 = 1738^2 + 837^2 .

It is an emirp because it is prime and its reverse (3121273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3721213 - 2⁹ = 3720701 is a prime.

3721213 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3721217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1860606 + 1860607.

It is an arithmetic number, because the mean of its divisors is an integer number (1860607).

Almost surely, 2^3721213 is an apocalyptic number.

It is an amenable number.

3721213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3721213 is an equidigital number, since it uses as much as digits as its factorization.

3721213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 19.

The square root of 3721213 is about 1929.0445821701. The cubic root of 3721213 is about 154.9630574463.

Adding to 3721213 its reverse (3121273), we get a palindrome (6842486).

The spelling of 3721213 in words is "three million, seven hundred twenty-one thousand, two hundred thirteen".