2009354821 has 2 divisors, whose sum is σ = 2009354822. Its totient is φ = 2009354820.

The previous prime is 2009354803. The next prime is 2009354827. The reversal of 2009354821 is 1284539002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1655350596 + 354004225 = 40686^2 + 18815^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009354821 - 2⁷ = 2009354693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009354827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004677410 + 1004677411.

It is an arithmetic number, because the mean of its divisors is an integer number (1004677411).

Almost surely, 2^2009354821 is an apocalyptic number.

It is an amenable number.

2009354821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009354821 is an equidigital number, since it uses as much as digits as its factorization.

2009354821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2009354821 is about 44825.8276108763. The cubic root of 2009354821 is about 1261.8823843931.

The spelling of 2009354821 in words is "two billion, nine million, three hundred fifty-four thousand, eight hundred twenty-one".