121221210101 has 8 divisors (see below), whose sum is σ = 125026136064. Its totient is φ = 117467357200.

The previous prime is 121221210017. The next prime is 121221210169. The reversal of 121221210101 is 101012122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121221210101 - 2³⁰ = 120147468277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221210401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12763445 + ... + 12772938.

It is an arithmetic number, because the mean of its divisors is an integer number (15628267008).

Almost surely, 2^121221210101 is an apocalyptic number.

It is an amenable number.

121221210101 is a deficient number, since it is larger than the sum of its proper divisors (3804925963).

121221210101 is a wasteful number, since it uses less digits than its factorization.

121221210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25536531.

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

Adding to 121221210101 its reverse (101012122121), we get a palindrome (222233332222).

The spelling of 121221210101 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".