121221100133 has 16 divisors (see below), whose sum is σ = 146880584064. Its totient is φ = 97663234560.

The previous prime is 121221100123. The next prime is 121221100151. The reversal of 121221100133 is 331001122121.

It is a cyclic number.

It is not a de Polignac number, because 121221100133 - 2⁶ = 121221100069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221100123) 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, 578735 + ... + 759852.

It is an arithmetic number, because the mean of its divisors is an integer number (9180036504).

Almost surely, 2^121221100133 is an apocalyptic number.

It is an amenable number.

121221100133 is a deficient number, since it is larger than the sum of its proper divisors (25659483931).

121221100133 is a wasteful number, since it uses less digits than its factorization.

121221100133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339372.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121221100133 its reverse (331001122121), we get a palindrome (452222222254).

The spelling of 121221100133 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, one hundred thirty-three".