1213213412 has 6 divisors (see below), whose sum is σ = 2123123478. Its totient is φ = 606606704.

The previous prime is 1213213409. The next prime is 1213213429. The reversal of 1213213412 is 2143123121.

It can be written as a sum of positive squares in only one way, i.e., 1198267456 + 14945956 = 34616^2 + 3866^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151651673 + ... + 151651680.

It is an arithmetic number, because the mean of its divisors is an integer number (353853913).

Almost surely, 2^1213213412 is an apocalyptic number.

It is an amenable number.

1213213412 is a deficient number, since it is larger than the sum of its proper divisors (909910066).

1213213412 is a wasteful number, since it uses less digits than its factorization.

1213213412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303303357 (or 303303355 counting only the distinct ones).

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

The square root of 1213213412 is about 34831.2131858768. The cubic root of 1213213412 is about 1066.5447139656.

Adding to 1213213412 its reverse (2143123121), we get a palindrome (3356336533).

The spelling of 1213213412 in words is "one billion, two hundred thirteen million, two hundred thirteen thousand, four hundred twelve".