2001120221 has 4 divisors (see below), whose sum is σ = 2088125472. Its totient is φ = 1914114972.

The previous prime is 2001120211. The next prime is 2001120227. The reversal of 2001120221 is 1220211002.

It is a happy number.

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 2001120221 - 2⁶ = 2001120157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001120227) 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, 43502591 + ... + 43502636.

It is an arithmetic number, because the mean of its divisors is an integer number (522031368).

Almost surely, 2^2001120221 is an apocalyptic number.

It is an amenable number.

2001120221 is a deficient number, since it is larger than the sum of its proper divisors (87005251).

2001120221 is an equidigital number, since it uses as much as digits as its factorization.

2001120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87005250.

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

The square root of 2001120221 is about 44733.8822482467. The cubic root of 2001120221 is about 1260.1562376597.

Adding to 2001120221 its reverse (1220211002), we get a palindrome (3221331223).

The spelling of 2001120221 in words is "two billion, one million, one hundred twenty thousand, two hundred twenty-one".