1213205300 has 18 divisors (see below), whose sum is σ = 2632655718. Its totient is φ = 485282080.

The previous prime is 1213205297. The next prime is 1213205303. The reversal of 1213205300 is 35023121.

It is an interprime number because it is at equal distance from previous prime (1213205297) and next prime (1213205303).

It can be written as a sum of positive squares in 3 ways, for example, as 633616 + 1212571684 = 796^2 + 34822^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213205303) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6065927 + ... + 6066126.

It is an arithmetic number, because the mean of its divisors is an integer number (146258651).

Almost surely, 2^1213205300 is an apocalyptic number.

1213205300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213205300 is an abundant number, since it is smaller than the sum of its proper divisors (1419450418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213205300 is a wasteful number, since it uses less digits than its factorization.

1213205300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12132067 (or 12132060 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1213205300 is about 34831.0967384032. The cubic root of 1213205300 is about 1066.5423368543.

Adding to 1213205300 its reverse (35023121), we get a palindrome (1248228421).

The spelling of 1213205300 in words is "one billion, two hundred thirteen million, two hundred five thousand, three hundred".