1321223212 has 6 divisors (see below), whose sum is σ = 2312140628. Its totient is φ = 660611604.

The previous prime is 1321223207. The next prime is 1321223213. The reversal of 1321223212 is 2123221231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321223212.

It is not an unprimeable number, because it can be changed into a prime (1321223213) by changing a digit.

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, 165152898 + ... + 165152905.

Almost surely, 2^1321223212 is an apocalyptic number.

It is an amenable number.

1321223212 is a deficient number, since it is larger than the sum of its proper divisors (990917416).

1321223212 is a wasteful number, since it uses less digits than its factorization.

1321223212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330305807 (or 330305805 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 1321223212 is about 36348.6342521972. The cubic root of 1321223212 is about 1097.3000483591.

Adding to 1321223212 its reverse (2123221231), we get a palindrome (3444444443).

The spelling of 1321223212 in words is "one billion, three hundred twenty-one million, two hundred twenty-three thousand, two hundred twelve".