121220103121221 has 16 divisors (see below), whose sum is σ = 174081368704320. Its totient is φ = 74587672199040.

The previous prime is 121220103121157. The next prime is 121220103121291. The reversal of 121220103121221 is 122121301022121.

It is not a de Polignac number, because 121220103121221 - 2⁶ = 121220103121157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220103121291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193732335 + ... + 194357036.

It is an arithmetic number, because the mean of its divisors is an integer number (10880085544020).

Almost surely, 2^{121220103121221} is an apocalyptic number.

It is an amenable number.

121220103121221 is a deficient number, since it is larger than the sum of its proper divisors (52861265583099).

121220103121221 is a wasteful number, since it uses less digits than its factorization.

121220103121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388097396.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 121220103121221 its reverse (122121301022121), we get a palindrome (243341404143342).

The spelling of 121220103121221 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred three million, one hundred twenty-one thousand, two hundred twenty-one".