1221314144 has 24 divisors (see below), whose sum is σ = 2405284560. Its totient is φ = 610448256.

The previous prime is 1221314141. The next prime is 1221314197. The reversal of 1221314144 is 4414131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221314141) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 137222 + ... + 145850.

It is an arithmetic number, because the mean of its divisors is an integer number (100220190).

Almost surely, 2^1221314144 is an apocalyptic number.

It is an amenable number.

1221314144 is a deficient number, since it is larger than the sum of its proper divisors (1183970416).

1221314144 is an equidigital number, since it uses as much as digits as its factorization.

1221314144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13062 (or 13054 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 1221314144 is about 34947.3052466138. The cubic root of 1221314144 is about 1068.9132542058.

Adding to 1221314144 its reverse (4414131221), we get a palindrome (5635445365).

The spelling of 1221314144 in words is "one billion, two hundred twenty-one million, three hundred fourteen thousand, one hundred forty-four".