1221033255 has 32 divisors (see below), whose sum is σ = 2176493760. Its totient is φ = 580392960.

The previous prime is 1221033199. The next prime is 1221033277. The reversal of 1221033255 is 5523301221.

It is a happy number.

It is not a de Polignac number, because 1221033255 - 2⁷ = 1221033127 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 102306 + ... + 113615.

It is an arithmetic number, because the mean of its divisors is an integer number (68015430).

Almost surely, 2^1221033255 is an apocalyptic number.

1221033255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221033255 is a deficient number, since it is larger than the sum of its proper divisors (955460505).

1221033255 is a wasteful number, since it uses less digits than its factorization.

1221033255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215971.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1221033255 is about 34943.2862650324. The cubic root of 1221033255 is about 1068.8313017731.

Adding to 1221033255 its reverse (5523301221), we get a palindrome (6744334476).

The spelling of 1221033255 in words is "one billion, two hundred twenty-one million, thirty-three thousand, two hundred fifty-five".