1321233212 has 18 divisors (see below), whose sum is σ = 2503699128. Its totient is φ = 609799632.

The previous prime is 1321233203. The next prime is 1321233247. The reversal of 1321233212 is 2123321231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 976568 + ... + 977919.

It is an arithmetic number, because the mean of its divisors is an integer number (139094396).

Almost surely, 2^1321233212 is an apocalyptic number.

It is an amenable number.

1321233212 is a deficient number, since it is larger than the sum of its proper divisors (1182465916).

1321233212 is a wasteful number, since it uses less digits than its factorization.

1321233212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954517 (or 1954502 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 1321233212 is about 36348.7718086870. The cubic root of 1321233212 is about 1097.3028167465.

Adding to 1321233212 its reverse (2123321231), we get a palindrome (3444554443).

The spelling of 1321233212 in words is "one billion, three hundred twenty-one million, two hundred thirty-three thousand, two hundred twelve".