2176921 has 2 divisors, whose sum is σ = 2176922. Its totient is φ = 2176920.

The previous prime is 2176891. The next prime is 2176939. The reversal of 2176921 is 1296712.

It is a happy number.

2176921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2175625 + 1296 = 1475^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 2176921 - 2⁹ = 2176409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2176921.

It is not a weakly prime, because it can be changed into another prime (2176121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1088460 + 1088461.

It is an arithmetic number, because the mean of its divisors is an integer number (1088461).

2^2176921 is an apocalyptic number.

It is an amenable number.

2176921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2176921 is an equidigital number, since it uses as much as digits as its factorization.

2176921 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2176921 is about 1475.4392566283. The cubic root of 2176921 is about 129.6027518404.

The spelling of 2176921 in words is "two million, one hundred seventy-six thousand, nine hundred twenty-one".