121221112220101 has 4 divisors (see below), whose sum is σ = 121480686336672. Its totient is φ = 120961538103532.

The previous prime is 121221112220063. The next prime is 121221112220113. The reversal of 121221112220101 is 101022211122121.

It is a happy number.

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 121221112220101 - 2⁹ = 121221112219589 is a prime.

It is a super-3 number, since 3×121221112220101³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221112220191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129787057585 + ... + 129787058518.

It is an arithmetic number, because the mean of its divisors is an integer number (30370171584168).

Almost surely, 2^{121221112220101} is an apocalyptic number.

It is an amenable number.

121221112220101 is a deficient number, since it is larger than the sum of its proper divisors (259574116571).

121221112220101 is an equidigital number, since it uses as much as digits as its factorization.

121221112220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259574116570.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121221112220101 its reverse (101022211122121), we get a palindrome (222243323342222).

The spelling of 121221112220101 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred one".