1221355968675 has 48 divisors (see below), whose sum is σ = 2075089313760. Its totient is φ = 633416509440.

The previous prime is 1221355968673. The next prime is 1221355968761. The reversal of 1221355968675 is 5768695531221.

It is not a de Polignac number, because 1221355968675 - 2¹ = 1221355968673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221355968673) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4682091 + ... + 4936059.

It is an arithmetic number, because the mean of its divisors is an integer number (43231027370).

Almost surely, 2^{1221355968675} is an apocalyptic number.

1221355968675 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221355968675 is a deficient number, since it is larger than the sum of its proper divisors (853733345085).

1221355968675 is a wasteful number, since it uses less digits than its factorization.

1221355968675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255752 (or 255747 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 60.

The spelling of 1221355968675 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-five million, nine hundred sixty-eight thousand, six hundred seventy-five".