1221001110133 has 16 divisors (see below), whose sum is σ = 1417271040000. Its totient is φ = 1030294184832.

The previous prime is 1221001110113. The next prime is 1221001110139. The reversal of 1221001110133 is 3310111001221.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221001110133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001110139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4136533 + ... + 4421866.

It is an arithmetic number, because the mean of its divisors is an integer number (88579440000).

Almost surely, 2^{1221001110133} is an apocalyptic number.

It is an amenable number.

1221001110133 is a deficient number, since it is larger than the sum of its proper divisors (196269929867).

1221001110133 is an equidigital number, since it uses as much as digits as its factorization.

1221001110133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8558724.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1221001110133 its reverse (3310111001221), we get a palindrome (4531112111354).

The spelling of 1221001110133 in words is "one trillion, two hundred twenty-one billion, one million, one hundred ten thousand, one hundred thirty-three".