42002920081 has 2 divisors, whose sum is σ = 42002920082. Its totient is φ = 42002920080.

The previous prime is 42002920079. The next prime is 42002920093. The reversal of 42002920081 is 18002920024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35503980625 + 6498939456 = 188425^2 + 80616^2 .

It is a cyclic number.

It is not a de Polignac number, because 42002920081 - 2¹ = 42002920079 is a prime.

It is a super-2 number, since 2×42002920081² (a number of 22 digits) contains 22 as substring.

Together with 42002920079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42002920031) 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, 21001460040 + 21001460041.

It is an arithmetic number, because the mean of its divisors is an integer number (21001460041).

Almost surely, 2^42002920081 is an apocalyptic number.

It is an amenable number.

42002920081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42002920081 is an equidigital number, since it uses as much as digits as its factorization.

42002920081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 42002920081 in words is "forty-two billion, two million, nine hundred twenty thousand, eighty-one".