1213320343 has 4 divisors (see below), whose sum is σ = 1214464968. Its totient is φ = 1212175720.

The previous prime is 1213320337. The next prime is 1213320347. The reversal of 1213320343 is 3430233121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3430233121 = 7 ⋅490033303.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213320343 is a prime.

It is a super-3 number, since 3×1213320343³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213320347) 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, 570721 + ... + 572842.

It is an arithmetic number, because the mean of its divisors is an integer number (303616242).

Almost surely, 2^1213320343 is an apocalyptic number.

1213320343 is a deficient number, since it is larger than the sum of its proper divisors (1144625).

1213320343 is a wasteful number, since it uses less digits than its factorization.

1213320343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144624.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 1213320343 is about 34832.7481402200. The cubic root of 1213320343 is about 1066.5760476510.

Adding to 1213320343 its reverse (3430233121), we get a palindrome (4643553464).

The spelling of 1213320343 in words is "one billion, two hundred thirteen million, three hundred twenty thousand, three hundred forty-three".