121221210100001 has 4 divisors (see below), whose sum is σ = 132241320109104. Its totient is φ = 110201100090900.

The previous prime is 121221210099961. The next prime is 121221210100057. The reversal of 121221210100001 is 100001012122121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121221210100001 - 2³⁰ = 121220136358177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221210108001) 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 3 ways as a sum of consecutive naturals, for example, 5510055004535 + ... + 5510055004556.

It is an arithmetic number, because the mean of its divisors is an integer number (33060330027276).

Almost surely, 2^{121221210100001} is an apocalyptic number.

121221210100001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221210100001 is a deficient number, since it is larger than the sum of its proper divisors (11020110009103).

121221210100001 is a wasteful number, since it uses less digits than its factorization.

121221210100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020110009102.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221210100001 its reverse (100001012122121), we get a palindrome (221222222222122).

The spelling of 121221210100001 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred ten million, one hundred thousand, one".