2002001001221 has 8 divisors (see below), whose sum is σ = 2172459103584. Its totient is φ = 1833894045360.

The previous prime is 2002001001157. The next prime is 2002001001223. The reversal of 2002001001221 is 1221001002002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2002001001221 - 2⁶ = 2002001001157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002001001223) 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, 587784851 + ... + 587788256.

It is an arithmetic number, because the mean of its divisors is an integer number (271557387948).

Almost surely, 2^{2002001001221} is an apocalyptic number.

It is an amenable number.

2002001001221 is a deficient number, since it is larger than the sum of its proper divisors (170458102363).

2002001001221 is a wasteful number, since it uses less digits than its factorization.

2002001001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175573251.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2002001001221 its reverse (1221001002002), we get a palindrome (3223002003223).

The spelling of 2002001001221 in words is "two trillion, two billion, one million, one thousand, two hundred twenty-one".