1221105530355 has 8 divisors (see below), whose sum is σ = 1953768848592. Its totient is φ = 651256282848.

The previous prime is 1221105530321. The next prime is 1221105530461. The reversal of 1221105530355 is 5530355011221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221105530355 - 2¹² = 1221105526259 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40703517664 + ... + 40703517693.

It is an arithmetic number, because the mean of its divisors is an integer number (244221106074).

Almost surely, 2^{1221105530355} is an apocalyptic number.

1221105530355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221105530355 is a deficient number, since it is larger than the sum of its proper divisors (732663318237).

1221105530355 is an equidigital number, since it uses as much as digits as its factorization.

1221105530355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81407035365.

The product of its (nonzero) digits is 22500, while the sum is 33.

The spelling of 1221105530355 in words is "one trillion, two hundred twenty-one billion, one hundred five million, five hundred thirty thousand, three hundred fifty-five".