2040658021 has 2 divisors, whose sum is σ = 2040658022. Its totient is φ = 2040658020.

The previous prime is 2040657991. The next prime is 2040658031. The reversal of 2040658021 is 1208560402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1619177121 + 421480900 = 40239^2 + 20530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2040658021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2040658031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020329010 + 1020329011.

It is an arithmetic number, because the mean of its divisors is an integer number (1020329011).

Almost surely, 2^2040658021 is an apocalyptic number.

It is an amenable number.

2040658021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2040658021 is an equidigital number, since it uses as much as digits as its factorization.

2040658021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 2040658021 is about 45173.6429901331. The cubic root of 2040658021 is about 1268.4014899957.

The spelling of 2040658021 in words is "two billion, forty million, six hundred fifty-eight thousand, twenty-one".