42503594921 has 2 divisors, whose sum is σ = 42503594922. Its totient is φ = 42503594920.

The previous prime is 42503594893. The next prime is 42503594941. The reversal of 42503594921 is 12949530524.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42503594896 + 25 = 206164^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 42503594921 - 2³⁰ = 41429853097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42503594941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21251797460 + 21251797461.

It is an arithmetic number, because the mean of its divisors is an integer number (21251797461).

Almost surely, 2^42503594921 is an apocalyptic number.

It is an amenable number.

42503594921 is a deficient number, since it is larger than the sum of its proper divisors (1).

42503594921 is an equidigital number, since it uses as much as digits as its factorization.

42503594921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 42503594921 in words is "forty-two billion, five hundred three million, five hundred ninety-four thousand, nine hundred twenty-one".