2001120001221 has 32 divisors (see below), whose sum is σ = 2980409236992. Its totient is φ = 1183800663360.

The previous prime is 2001120001207. The next prime is 2001120001249. The reversal of 2001120001221 is 1221000211002.

It is not a de Polignac number, because 2001120001221 - 2⁶ = 2001120001157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001120001197 and 2001120001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001120001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1646286 + ... + 2590848.

It is an arithmetic number, because the mean of its divisors is an integer number (93137788656).

Almost surely, 2^{2001120001221} is an apocalyptic number.

It is an amenable number.

2001120001221 is a deficient number, since it is larger than the sum of its proper divisors (979289235771).

2001120001221 is a wasteful number, since it uses less digits than its factorization.

2001120001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946113.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2001120001221 its reverse (1221000211002), we get a palindrome (3222120212223).

The spelling of 2001120001221 in words is "two trillion, one billion, one hundred twenty million, one thousand, two hundred twenty-one".