42421021387 has 2 divisors, whose sum is σ = 42421021388. Its totient is φ = 42421021386.

The previous prime is 42421021351. The next prime is 42421021427. The reversal of 42421021387 is 78312012424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42421021387 - 2¹¹ = 42421019339 is a prime.

It is a super-3 number, since 3×42421021387³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (42421027387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210510693 + 21210510694.

It is an arithmetic number, because the mean of its divisors is an integer number (21210510694).

Almost surely, 2^42421021387 is an apocalyptic number.

42421021387 is a deficient number, since it is larger than the sum of its proper divisors (1).

42421021387 is an equidigital number, since it uses as much as digits as its factorization.

42421021387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 42421021387 in words is "forty-two billion, four hundred twenty-one million, twenty-one thousand, three hundred eighty-seven".