1221105310255 has 16 divisors (see below), whose sum is σ = 1493774309664. Its totient is φ = 957938716800.

The previous prime is 1221105310237. The next prime is 1221105310291. The reversal of 1221105310255 is 5520135011221.

It is a happy number.

It is not a de Polignac number, because 1221105310255 - 2¹¹ = 1221105308207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739296 + ... + 1728805.

It is an arithmetic number, because the mean of its divisors is an integer number (93360894354).

Almost surely, 2^{1221105310255} is an apocalyptic number.

1221105310255 is a deficient number, since it is larger than the sum of its proper divisors (272668999409).

1221105310255 is a wasteful number, since it uses less digits than its factorization.

1221105310255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470026.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 1221105310255 in words is "one trillion, two hundred twenty-one billion, one hundred five million, three hundred ten thousand, two hundred fifty-five".