1213243412 has 12 divisors (see below), whose sum is σ = 2133954900. Its totient is φ = 603542016.

The previous prime is 1213243363. The next prime is 1213243433. The reversal of 1213243412 is 2143423121.

It can be written as a sum of positive squares in 2 ways, for example, as 1052613136 + 160630276 = 32444^2 + 12674^2 .

It is a super-2 number, since 2×1213243412² = 2943919153522803488, which contains 22 as substring.

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, 769037 + ... + 770612.

It is an arithmetic number, because the mean of its divisors is an integer number (177829575).

Almost surely, 2^1213243412 is an apocalyptic number.

It is an amenable number.

1213243412 is a deficient number, since it is larger than the sum of its proper divisors (920711488).

1213243412 is a wasteful number, since it uses less digits than its factorization.

1213243412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539850 (or 1539848 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 1213243412 is about 34831.6438314358. The cubic root of 1213243412 is about 1066.5535049657.

Adding to 1213243412 its reverse (2143423121), we get a palindrome (3356666533).

The spelling of 1213243412 in words is "one billion, two hundred thirteen million, two hundred forty-three thousand, four hundred twelve".