2001760921 has 4 divisors (see below), whose sum is σ = 2009550132. Its totient is φ = 1993971712.

The previous prime is 2001760907. The next prime is 2001760951. The reversal of 2001760921 is 1290671002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1290671002 = 2 ⋅645335501.

It can be written as a sum of positive squares in 2 ways, for example, as 1325760921 + 676000000 = 36411^2 + 26000^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001760921 - 2¹¹ = 2001758873 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 2001760921.

It is not an unprimeable number, because it can be changed into a prime (2001760951) 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, 3894220 + ... + 3894733.

It is an arithmetic number, because the mean of its divisors is an integer number (502387533).

Almost surely, 2^2001760921 is an apocalyptic number.

It is an amenable number.

2001760921 is a deficient number, since it is larger than the sum of its proper divisors (7789211).

2001760921 is an equidigital number, since it uses as much as digits as its factorization.

2001760921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7789210.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 2001760921 is about 44741.0429136380. The cubic root of 2001760921 is about 1260.2907116644.

The spelling of 2001760921 in words is "two billion, one million, seven hundred sixty thousand, nine hundred twenty-one".