2023921 has 2 divisors, whose sum is σ = 2023922. Its totient is φ = 2023920.

The previous prime is 2023913. The next prime is 2023951. The reversal of 2023921 is 1293202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073296 + 950625 = 1036^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2023921 - 2³ = 2023913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2023951) 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, 1011960 + 1011961.

It is an arithmetic number, because the mean of its divisors is an integer number (1011961).

2^2023921 is an apocalyptic number.

It is an amenable number.

2023921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2023921 is an equidigital number, since it uses as much as digits as its factorization.

2023921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2023921 is about 1422.6457746045. The cubic root of 2023921 is about 126.4924250907.

The spelling of 2023921 in words is "two million, twenty-three thousand, nine hundred twenty-one".