1242215213 has 2 divisors, whose sum is σ = 1242215214. Its totient is φ = 1242215212.

The previous prime is 1242215207. The next prime is 1242215239. The reversal of 1242215213 is 3125122421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 909444649 + 332770564 = 30157^2 + 18242^2 .

It is an emirp because it is prime and its reverse (3125122421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242215213 - 2¹⁴ = 1242198829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242215263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621107606 + 621107607.

It is an arithmetic number, because the mean of its divisors is an integer number (621107607).

Almost surely, 2^1242215213 is an apocalyptic number.

It is an amenable number.

1242215213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242215213 is an equidigital number, since it uses as much as digits as its factorization.

1242215213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 1242215213 is about 35245.0735990152. The cubic root of 1242215213 is about 1074.9764445533.

Adding to 1242215213 its reverse (3125122421), we get a palindrome (4367337634).

The spelling of 1242215213 in words is "one billion, two hundred forty-two million, two hundred fifteen thousand, two hundred thirteen".