2002001221 has 4 divisors (see below), whose sum is σ = 2184001344. Its totient is φ = 1820001100.

The previous prime is 2002001207. The next prime is 2002001249. The reversal of 2002001221 is 1221002002.

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 not a de Polignac number, because 2002001221 - 2⁵ = 2002001189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002001198 and 2002001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002001021) 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, 91000045 + ... + 91000066.

It is an arithmetic number, because the mean of its divisors is an integer number (546000336).

Almost surely, 2^2002001221 is an apocalyptic number.

It is an amenable number.

2002001221 is a deficient number, since it is larger than the sum of its proper divisors (182000123).

2002001221 is a wasteful number, since it uses less digits than its factorization.

2002001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182000122.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2002001221 is about 44743.7282867666. The cubic root of 2002001221 is about 1260.3411398878.

Adding to 2002001221 its reverse (1221002002), we get a palindrome (3223003223).

The spelling of 2002001221 in words is "two billion, two million, one thousand, two hundred twenty-one".