1221415144 has 8 divisors (see below), whose sum is σ = 2290153410. Its totient is φ = 610707568.

The previous prime is 1221415093. The next prime is 1221415147. The reversal of 1221415144 is 4415141221.

It can be written as a sum of positive squares in only one way, i.e., 657922500 + 563492644 = 25650^2 + 23738^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1221415147) 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 as a sum of consecutive naturals, namely, 76338439 + ... + 76338454.

Almost surely, 2^1221415144 is an apocalyptic number.

It is an amenable number.

1221415144 is a deficient number, since it is larger than the sum of its proper divisors (1068738266).

1221415144 is a wasteful number, since it uses less digits than its factorization.

1221415144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152676899 (or 152676895 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 1221415144 is about 34948.7502494724. The cubic root of 1221415144 is about 1068.9427189872.

Adding to 1221415144 its reverse (4415141221), we get a palindrome (5636556365).

The spelling of 1221415144 in words is "one billion, two hundred twenty-one million, four hundred fifteen thousand, one hundred forty-four".