42421021427 has 2 divisors, whose sum is σ = 42421021428. Its totient is φ = 42421021426.

The previous prime is 42421021387. The next prime is 42421021429. The reversal of 42421021427 is 72412012424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42421021427 is a prime.

Together with 42421021429, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42421021427.

It is not a weakly prime, because it can be changed into another prime (42421021429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210510713 + 21210510714.

It is an arithmetic number, because the mean of its divisors is an integer number (21210510714).

Almost surely, 2^42421021427 is an apocalyptic number.

42421021427 is a deficient number, since it is larger than the sum of its proper divisors (1).

42421021427 is an equidigital number, since it uses as much as digits as its factorization.

42421021427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 29.

The spelling of 42421021427 in words is "forty-two billion, four hundred twenty-one million, twenty-one thousand, four hundred twenty-seven".