2029921 has 2 divisors, whose sum is σ = 2029922. Its totient is φ = 2029920.

The previous prime is 2029891. The next prime is 2029939. The reversal of 2029921 is 1299202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 245025 = 1336^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2029921 - 2⁵ = 2029889 is a prime.

It is not a weakly prime, because it can be changed into another prime (2029981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014960 + 1014961.

It is an arithmetic number, because the mean of its divisors is an integer number (1014961).

2^2029921 is an apocalyptic number.

It is an amenable number.

2029921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2029921 is an equidigital number, since it uses as much as digits as its factorization.

2029921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2029921 is about 1424.7529610427. The cubic root of 2029921 is about 126.6172991675.

The spelling of 2029921 in words is "two million, twenty-nine thousand, nine hundred twenty-one".