1221033256 has 16 divisors (see below), whose sum is σ = 2298146400. Its totient is φ = 608194224.

The previous prime is 1221033199. The next prime is 1221033277. The reversal of 1221033256 is 6523301221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221033256.

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, 288066 + ... + 292273.

It is an arithmetic number, because the mean of its divisors is an integer number (143634150).

Almost surely, 2^1221033256 is an apocalyptic number.

It is an amenable number.

1221033256 is a deficient number, since it is larger than the sum of its proper divisors (1077113144).

1221033256 is a wasteful number, since it uses less digits than its factorization.

1221033256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580608 (or 580604 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1221033256 is about 34943.2862793413. The cubic root of 1221033256 is about 1068.8313020649.

Adding to 1221033256 its reverse (6523301221), we get a palindrome (7744334477).

The spelling of 1221033256 in words is "one billion, two hundred twenty-one million, thirty-three thousand, two hundred fifty-six".