1221001120121 has 8 divisors (see below), whose sum is σ = 1232923124160. Its totient is φ = 1209080416752.

The previous prime is 1221001120103. The next prime is 1221001120123. The reversal of 1221001120121 is 1210211001221.

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 1221001120121 - 2¹⁴ = 1221001103737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221001120096 and 1221001120105.

It is not an unprimeable number, because it can be changed into a prime (1221001120123) 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 7 ways as a sum of consecutive naturals, for example, 1617890 + ... + 2249348.

It is an arithmetic number, because the mean of its divisors is an integer number (154115390520).

Almost surely, 2^{1221001120121} is an apocalyptic number.

It is an amenable number.

1221001120121 is a deficient number, since it is larger than the sum of its proper divisors (11922004039).

1221001120121 is a wasteful number, since it uses less digits than its factorization.

1221001120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650335.

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

Adding to 1221001120121 its reverse (1210211001221), we get a palindrome (2431212121342).

The spelling of 1221001120121 in words is "one trillion, two hundred twenty-one billion, one million, one hundred twenty thousand, one hundred twenty-one".