120121221121221 has 32 divisors (see below), whose sum is σ = 160534086451200. Its totient is φ = 79894879545600.

The previous prime is 120121221121211. The next prime is 120121221121229. The reversal of 120121221121221 is 122121122121021.

It is not a de Polignac number, because 120121221121221 - 2¹⁹ = 120121220596933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121221121229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7009457565 + ... + 7009474701.

It is an arithmetic number, because the mean of its divisors is an integer number (5016690201600).

Almost surely, 2^{120121221121221} is an apocalyptic number.

It is an amenable number.

120121221121221 is a deficient number, since it is larger than the sum of its proper divisors (40412865329979).

120121221121221 is a wasteful number, since it uses less digits than its factorization.

120121221121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21129.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 120121221121221 its reverse (122121122121021), we get a palindrome (242242343242242).

The spelling of 120121221121221 in words is "one hundred twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".