42293952821 has 2 divisors, whose sum is σ = 42293952822. Its totient is φ = 42293952820.

The previous prime is 42293952793. The next prime is 42293952889. The reversal of 42293952821 is 12825939224.

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., 28106522500 + 14187430321 = 167650^2 + 119111^2 .

It is a cyclic number.

It is not a de Polignac number, because 42293952821 - 2¹⁴ = 42293936437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42293952721) 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, 21146976410 + 21146976411.

It is an arithmetic number, because the mean of its divisors is an integer number (21146976411).

Almost surely, 2^42293952821 is an apocalyptic number.

It is an amenable number.

42293952821 is a deficient number, since it is larger than the sum of its proper divisors (1).

42293952821 is an equidigital number, since it uses as much as digits as its factorization.

42293952821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 47.

The spelling of 42293952821 in words is "forty-two billion, two hundred ninety-three million, nine hundred fifty-two thousand, eight hundred twenty-one".