42025903921 has 2 divisors, whose sum is σ = 42025903922. Its totient is φ = 42025903920.

The previous prime is 42025903897. The next prime is 42025904023. The reversal of 42025903921 is 12930952024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38873642896 + 3152261025 = 197164^2 + 56145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42025903921 is a prime.

It is not a weakly prime, because it can be changed into another prime (42025903321) 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, 21012951960 + 21012951961.

It is an arithmetic number, because the mean of its divisors is an integer number (21012951961).

Almost surely, 2^42025903921 is an apocalyptic number.

It is an amenable number.

42025903921 is a deficient number, since it is larger than the sum of its proper divisors (1).

42025903921 is an equidigital number, since it uses as much as digits as its factorization.

42025903921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 42025903921 in words is "forty-two billion, twenty-five million, nine hundred three thousand, nine hundred twenty-one".