121166533401 has 24 divisors (see below), whose sum is σ = 166412080800. Its totient is φ = 78418271232.

The previous prime is 121166533357. The next prime is 121166533409. The reversal of 121166533401 is 104335661121.

It is a happy number.

It is not a de Polignac number, because 121166533401 - 2¹⁹ = 121166009113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121166533409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1811190 + ... + 1876896.

It is an arithmetic number, because the mean of its divisors is an integer number (6933836700).

Almost surely, 2^121166533401 is an apocalyptic number.

It is an amenable number.

121166533401 is a deficient number, since it is larger than the sum of its proper divisors (45245547399).

121166533401 is an equidigital number, since it uses as much as digits as its factorization.

121166533401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66233 (or 66196 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 121166533401 in words is "one hundred twenty-one billion, one hundred sixty-six million, five hundred thirty-three thousand, four hundred one".