1221146612 has 12 divisors (see below), whose sum is σ = 2442293280. Its totient is φ = 523348536.

The previous prime is 1221146593. The next prime is 1221146629. The reversal of 1221146612 is 2166411221.

1221146612 is an admirable number.

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, 21806162 + ... + 21806217.

It is an arithmetic number, because the mean of its divisors is an integer number (203524440).

Almost surely, 2^1221146612 is an apocalyptic number.

It is an amenable number.

1221146612 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221146612 is a wasteful number, since it uses less digits than its factorization.

1221146612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43612390 (or 43612388 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 1221146612 is about 34944.9082414019. The cubic root of 1221146612 is about 1068.8643764280.

Adding to 1221146612 its reverse (2166411221), we get a palindrome (3387557833).

The spelling of 1221146612 in words is "one billion, two hundred twenty-one million, one hundred forty-six thousand, six hundred twelve".