1221350612 has 18 divisors (see below), whose sum is σ = 2196701262. Its totient is φ = 594167904.

The previous prime is 1221350587. The next prime is 1221350621. The reversal of 1221350612 is 2160531221.

It can be written as a sum of positive squares in 3 ways, for example, as 592143556 + 629207056 = 24334^2 + 25084^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106043 + ... + 116994.

It is an arithmetic number, because the mean of its divisors is an integer number (122038959).

Almost surely, 2^1221350612 is an apocalyptic number.

It is an amenable number.

1221350612 is a deficient number, since it is larger than the sum of its proper divisors (975350650).

1221350612 is a wasteful number, since it uses less digits than its factorization.

1221350612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223115 (or 223076 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1221350612 is about 34947.8269996863. The cubic root of 1221350612 is about 1068.9238932214.

Adding to 1221350612 its reverse (2160531221), we get a palindrome (3381881833).

The spelling of 1221350612 in words is "one billion, two hundred twenty-one million, three hundred fifty thousand, six hundred twelve".