1213200312 has 32 divisors (see below), whose sum is σ = 3192633600. Its totient is φ = 383115744.

The previous prime is 1213200311. The next prime is 1213200319. The reversal of 1213200312 is 2130023121.

It is a junction number, because it is equal to n+sod(n) for n = 1213200291 and 1213200300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213200311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329808 + ... + 1330719.

It is an arithmetic number, because the mean of its divisors is an integer number (99769800).

Almost surely, 2^1213200312 is an apocalyptic number.

1213200312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213200312 is an abundant number, since it is smaller than the sum of its proper divisors (1979433288).

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

1213200312 is a wasteful number, since it uses less digits than its factorization.

1213200312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660555 (or 2660551 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1213200312 is about 34831.0251356460. The cubic root of 1213200312 is about 1066.5408751834.

Adding to 1213200312 its reverse (2130023121), we get a palindrome (3343223433).

The spelling of 1213200312 in words is "one billion, two hundred thirteen million, two hundred thousand, three hundred twelve".