1213123412 has 12 divisors (see below), whose sum is σ = 2132319840. Its totient is φ = 603889176.

The previous prime is 1213123399. The next prime is 1213123421. The reversal of 1213123412 is 2143213121.

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, 667112 + ... + 668927.

It is an arithmetic number, because the mean of its divisors is an integer number (177693320).

Almost surely, 2^1213123412 is an apocalyptic number.

It is an amenable number.

1213123412 is a deficient number, since it is larger than the sum of its proper divisors (919196428).

1213123412 is a wasteful number, since it uses less digits than its factorization.

1213123412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336270 (or 1336268 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 1213123412 is about 34829.9212172523. The cubic root of 1213123412 is about 1066.5183400957.

Adding to 1213123412 its reverse (2143213121), we get a palindrome (3356336533).

The spelling of 1213123412 in words is "one billion, two hundred thirteen million, one hundred twenty-three thousand, four hundred twelve".