1221828076 has 12 divisors (see below), whose sum is σ = 2443656208. Its totient is φ = 523640592.

The previous prime is 1221828067. The next prime is 1221828077. The reversal of 1221828076 is 6708281221.

1221828076 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1221828077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21818331 + ... + 21818386.

Almost surely, 2^1221828076 is an apocalyptic number.

It is an amenable number.

1221828076 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.

1221828076 is a wasteful number, since it uses less digits than its factorization.

1221828076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43636728 (or 43636726 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 1221828076 is about 34954.6574293040. The cubic root of 1221828076 is about 1069.0631669566.

The spelling of 1221828076 in words is "one billion, two hundred twenty-one million, eight hundred twenty-eight thousand, seventy-six".