1221333055507 has 4 divisors (see below), whose sum is σ = 1222226497296. Its totient is φ = 1220439613720.

The previous prime is 1221333055483. The next prime is 1221333055511. The reversal of 1221333055507 is 7055503331221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221333055507 - 2⁷ = 1221333055379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221303055507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446718844 + ... + 446721577.

It is an arithmetic number, because the mean of its divisors is an integer number (305556624324).

Almost surely, 2^{1221333055507} is an apocalyptic number.

1221333055507 is a deficient number, since it is larger than the sum of its proper divisors (893441789).

1221333055507 is an equidigital number, since it uses as much as digits as its factorization.

1221333055507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893441788.

The product of its (nonzero) digits is 94500, while the sum is 37.

Adding to 1221333055507 its reverse (7055503331221), we get a palindrome (8276836386728).

The spelling of 1221333055507 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, fifty-five thousand, five hundred seven".