2002001220221 has 4 divisors (see below), whose sum is σ = 2044596990912. Its totient is φ = 1959405449532.

The previous prime is 2002001220077. The next prime is 2002001220227. The reversal of 2002001220221 is 1220221002002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002001220221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2002001220196 and 2002001220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002001220227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21297885275 + ... + 21297885368.

It is an arithmetic number, because the mean of its divisors is an integer number (511149247728).

Almost surely, 2^{2002001220221} is an apocalyptic number.

It is an amenable number.

2002001220221 is a deficient number, since it is larger than the sum of its proper divisors (42595770691).

2002001220221 is an equidigital number, since it uses as much as digits as its factorization.

2002001220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42595770690.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2002001220221 its reverse (1220221002002), we get a palindrome (3222222222223).

It can be divided in two parts, 2002001 and 220221, that added together give a palindrome (2222222).

The spelling of 2002001220221 in words is "two trillion, two billion, one million, two hundred twenty thousand, two hundred twenty-one".