1221113512 has 8 divisors (see below), whose sum is σ = 2289587850. Its totient is φ = 610556752.

The previous prime is 1221113497. The next prime is 1221113521. The reversal of 1221113512 is 2153111221.

It can be written as a sum of positive squares in only one way, i.e., 779861476 + 441252036 = 27926^2 + 21006^2 .

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

It is a super-2 number, since 2×1221113512² = 2982236418377948288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221113512.

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 as a sum of consecutive naturals, namely, 76319587 + ... + 76319602.

Almost surely, 2^1221113512 is an apocalyptic number.

It is an amenable number.

1221113512 is a deficient number, since it is larger than the sum of its proper divisors (1068474338).

1221113512 is a wasteful number, since it uses less digits than its factorization.

1221113512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152639195 (or 152639191 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 1221113512 is about 34944.4346355754. The cubic root of 1221113512 is about 1068.8547189115.

Adding to 1221113512 its reverse (2153111221), we get a palindrome (3374224733).

The spelling of 1221113512 in words is "one billion, two hundred twenty-one million, one hundred thirteen thousand, five hundred twelve".