1221312202 has 16 divisors (see below), whose sum is σ = 2041034112. Its totient is φ = 543329920.

The previous prime is 1221312199. The next prime is 1221312203. The reversal of 1221312202 is 2022131221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221312203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589543 + ... + 591610.

It is an arithmetic number, because the mean of its divisors is an integer number (127564632).

Almost surely, 2^1221312202 is an apocalyptic number.

1221312202 is a deficient number, since it is larger than the sum of its proper divisors (819721910).

1221312202 is a wasteful number, since it uses less digits than its factorization.

1221312202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181213.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221312202 is about 34947.2774619140. The cubic root of 1221312202 is about 1068.9126876493.

Adding to 1221312202 its reverse (2022131221), we get a palindrome (3243443423).

The spelling of 1221312202 in words is "one billion, two hundred twenty-one million, three hundred twelve thousand, two hundred two".