2001000221 has 4 divisors (see below), whose sum is σ = 2182909344. Its totient is φ = 1819091100.

The previous prime is 2001000151. The next prime is 2001000223. The reversal of 2001000221 is 1220001002.

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-2001000221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001000199 and 2001000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001000223) 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, 90954545 + ... + 90954566.

It is an arithmetic number, because the mean of its divisors is an integer number (545727336).

Almost surely, 2^2001000221 is an apocalyptic number.

It is an amenable number.

2001000221 is a deficient number, since it is larger than the sum of its proper divisors (181909123).

2001000221 is a wasteful number, since it uses less digits than its factorization.

2001000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181909122.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 2001000221 is about 44732.5409629276. The cubic root of 2001000221 is about 1260.1310481401.

Adding to 2001000221 its reverse (1220001002), we get a palindrome (3221001223).

The spelling of 2001000221 in words is "two billion, one million, two hundred twenty-one", and thus it is an aban number.