120121001221 has 16 divisors (see below), whose sum is σ = 142089978240. Its totient is φ = 100477903680.

The previous prime is 120121001213. The next prime is 120121001227. The reversal of 120121001221 is 122100121021.

It is not a de Polignac number, because 120121001221 - 2³ = 120121001213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121001227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10566490 + ... + 10577851.

It is an arithmetic number, because the mean of its divisors is an integer number (8880623640).

Almost surely, 2^120121001221 is an apocalyptic number.

It is an amenable number.

120121001221 is a deficient number, since it is larger than the sum of its proper divisors (21968977019).

120121001221 is a wasteful number, since it uses less digits than its factorization.

120121001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21144396.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 120121001221 its reverse (122100121021), we get a palindrome (242221122242).

The spelling of 120121001221 in words is "one hundred twenty billion, one hundred twenty-one million, one thousand, two hundred twenty-one".