2001711221 has 4 divisors (see below), whose sum is σ = 2014461132. Its totient is φ = 1988961312.

The previous prime is 2001711209. The next prime is 2001711227. The reversal of 2001711221 is 1221171002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 308388721 + 1693322500 = 17561^2 + 41150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001711221 - 2¹⁴ = 2001694837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001711221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001711227) 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 3 ways as a sum of consecutive naturals, for example, 6374720 + ... + 6375033.

It is an arithmetic number, because the mean of its divisors is an integer number (503615283).

Almost surely, 2^2001711221 is an apocalyptic number.

It is an amenable number.

2001711221 is a deficient number, since it is larger than the sum of its proper divisors (12749911).

2001711221 is a wasteful number, since it uses less digits than its factorization.

2001711221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12749910.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 2001711221 is about 44740.4874917563. The cubic root of 2001711221 is about 1260.2802813534.

Adding to 2001711221 its reverse (1221171002), we get a palindrome (3222882223).

The spelling of 2001711221 in words is "two billion, one million, seven hundred eleven thousand, two hundred twenty-one".