2231213213 has 2 divisors, whose sum is σ = 2231213214. Its totient is φ = 2231213212.

The previous prime is 2231213147. The next prime is 2231213249. The reversal of 2231213213 is 3123121322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2149527769 + 81685444 = 46363^2 + 9038^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231213213 - 2²² = 2227018909 is a prime.

It is a super-3 number, since 3×2231213213³ (a number of 29 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231213813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115606606 + 1115606607.

It is an arithmetic number, because the mean of its divisors is an integer number (1115606607).

Almost surely, 2^2231213213 is an apocalyptic number.

It is an amenable number.

2231213213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231213213 is an equidigital number, since it uses as much as digits as its factorization.

2231213213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 20.

The square root of 2231213213 is about 47235.7196727223. The cubic root of 2231213213 is about 1306.7134391302.

Adding to 2231213213 its reverse (3123121322), we get a palindrome (5354334535).

The spelling of 2231213213 in words is "two billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred thirteen".