1221035512 has 16 divisors (see below), whose sum is σ = 2309703840. Its totient is φ = 605114496.

The previous prime is 1221035509. The next prime is 1221035521. The reversal of 1221035512 is 2155301221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674448 + ... + 676255.

It is an arithmetic number, because the mean of its divisors is an integer number (144356490).

Almost surely, 2^1221035512 is an apocalyptic number.

It is an amenable number.

1221035512 is a deficient number, since it is larger than the sum of its proper divisors (1088668328).

1221035512 is a wasteful number, since it uses less digits than its factorization.

1221035512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350822 (or 1350818 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1221035512 is about 34943.3185602055. The cubic root of 1221035512 is about 1068.8319603276.

Adding to 1221035512 its reverse (2155301221), we get a palindrome (3376336733).

The spelling of 1221035512 in words is "one billion, two hundred twenty-one million, thirty-five thousand, five hundred twelve".