2001221120121 has 16 divisors (see below), whose sum is σ = 2709974620800. Its totient is φ = 1313465995520.

The previous prime is 2001221120077. The next prime is 2001221120141. The reversal of 2001221120121 is 1210211221002.

It is a cyclic number.

It is not a de Polignac number, because 2001221120121 - 2⁶ = 2001221120057 is a prime.

It is a super-2 number, since 2×2001221120121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2001221120121.

It is not an unprimeable number, because it can be changed into a prime (2001221120141) 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, 19759245 + ... + 19860266.

It is an arithmetic number, because the mean of its divisors is an integer number (169373413800).

Almost surely, 2^{2001221120121} is an apocalyptic number.

It is an amenable number.

2001221120121 is a deficient number, since it is larger than the sum of its proper divisors (708753500679).

2001221120121 is a wasteful number, since it uses less digits than its factorization.

2001221120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39619776.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001221120121 its reverse (1210211221002), we get a palindrome (3211432341123).

The spelling of 2001221120121 in words is "two trillion, one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".