1243204513212 has 12 divisors (see below), whose sum is σ = 2900810530856. Its totient is φ = 414401504400.

The previous prime is 1243204513193. The next prime is 1243204513231. The reversal of 1243204513212 is 2123154023421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1243204513193) and next prime (1243204513231).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1243204513212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51800188039 + ... + 51800188062.

Almost surely, 2^{1243204513212} is an apocalyptic number.

1243204513212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1243204513212 is an abundant number, since it is smaller than the sum of its proper divisors (1657606017644).

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

1243204513212 is a wasteful number, since it uses less digits than its factorization.

1243204513212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103600376108 (or 103600376106 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 1243204513212 its reverse (2123154023421), we get a palindrome (3366358536633).

The spelling of 1243204513212 in words is "one trillion, two hundred forty-three billion, two hundred four million, five hundred thirteen thousand, two hundred twelve".