2031921 has 6 divisors (see below), whose sum is σ = 2935010. Its totient is φ = 1354608.

The previous prime is 2031907. The next prime is 2031937. The reversal of 2031921 is 1291302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2030625 + 1296 = 1425^2 + 36^2 .

It is not a de Polignac number, because 2031921 - 2⁹ = 2031409 is a prime.

It is a Duffinian number.

2031921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2031894 and 2031903.

It is not an unprimeable number, because it can be changed into a prime (2031961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112876 + ... + 112893.

2^2031921 is an apocalyptic number.

It is an amenable number.

2031921 is a deficient number, since it is larger than the sum of its proper divisors (903089).

2031921 is a wasteful number, since it uses less digits than its factorization.

2031921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225775 (or 225772 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2031921 is about 1425.4546643089. The cubic root of 2031921 is about 126.6588691722.

The spelling of 2031921 in words is "two million, thirty-one thousand, nine hundred twenty-one".