2001621171 has 16 divisors (see below), whose sum is σ = 2913840000. Its totient is φ = 1212107520.

The previous prime is 2001621169. The next prime is 2001621187. The reversal of 2001621171 is 1711261002.

It is a happy number.

It is not a de Polignac number, because 2001621171 - 2¹ = 2001621169 is a prime.

It is a super-2 number, since 2×2001621171² = 8012974624390822482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001621071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16936 + ... + 65498.

It is an arithmetic number, because the mean of its divisors is an integer number (182115000).

Almost surely, 2^2001621171 is an apocalyptic number.

2001621171 is a deficient number, since it is larger than the sum of its proper divisors (912218829).

2001621171 is a wasteful number, since it uses less digits than its factorization.

2001621171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49826.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 2001621171 is about 44739.4811212647. The cubic root of 2001621171 is about 1260.2613825333.

Adding to 2001621171 its reverse (1711261002), we get a palindrome (3712882173).

The spelling of 2001621171 in words is "two billion, one million, six hundred twenty-one thousand, one hundred seventy-one".