1212323213 has 4 divisors (see below), whose sum is σ = 1213051260. Its totient is φ = 1211595168.

The previous prime is 1212323207. The next prime is 1212323239. The reversal of 1212323213 is 3123232121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212372329 + 999950884 = 14573^2 + 31622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212323213 - 2⁸ = 1212322957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212323243) 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, 361520 + ... + 364857.

It is an arithmetic number, because the mean of its divisors is an integer number (303262815).

Almost surely, 2^1212323213 is an apocalyptic number.

It is an amenable number.

1212323213 is a deficient number, since it is larger than the sum of its proper divisors (728047).

1212323213 is an equidigital number, since it uses as much as digits as its factorization.

1212323213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728046.

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

The square root of 1212323213 is about 34818.4320870426. The cubic root of 1212323213 is about 1066.2837900038.

Adding to 1212323213 its reverse (3123232121), we get a palindrome (4335555334).

The spelling of 1212323213 in words is "one billion, two hundred twelve million, three hundred twenty-three thousand, two hundred thirteen".