1213221341 has 4 divisors (see below), whose sum is σ = 1215114684. Its totient is φ = 1211328000.

The previous prime is 1213221323. The next prime is 1213221343. The reversal of 1213221341 is 1431223121.

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 1065696025 + 147525316 = 32645^2 + 12146^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213221341 - 2⁶ = 1213221277 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 (1213221343) 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, 945710 + ... + 946991.

It is an arithmetic number, because the mean of its divisors is an integer number (303778671).

Almost surely, 2^1213221341 is an apocalyptic number.

It is an amenable number.

1213221341 is a deficient number, since it is larger than the sum of its proper divisors (1893343).

1213221341 is an equidigital number, since it uses as much as digits as its factorization.

1213221341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893342.

The product of its digits is 288, while the sum is 20.

The square root of 1213221341 is about 34831.3270060157. The cubic root of 1213221341 is about 1066.5470374410.

Adding to 1213221341 its reverse (1431223121), we get a palindrome (2644444462).

The spelling of 1213221341 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, three hundred forty-one".