1213320243 has 32 divisors (see below), whose sum is σ = 1763735040. Its totient is φ = 738823680.

The previous prime is 1213320233. The next prime is 1213320271. The reversal of 1213320243 is 3420233121.

It is not a de Polignac number, because 1213320243 - 2¹⁴ = 1213303859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213320233) 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 31 ways as a sum of consecutive naturals, for example, 1190188 + ... + 1191206.

It is an arithmetic number, because the mean of its divisors is an integer number (55116720).

Almost surely, 2^1213320243 is an apocalyptic number.

1213320243 is a deficient number, since it is larger than the sum of its proper divisors (550414797).

1213320243 is a wasteful number, since it uses less digits than its factorization.

1213320243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1213320243 is about 34832.7467047892. The cubic root of 1213320243 is about 1066.5760183492.

Adding to 1213320243 its reverse (3420233121), we get a palindrome (4633553364).

The spelling of 1213320243 in words is "one billion, two hundred thirteen million, three hundred twenty thousand, two hundred forty-three".