42820353481 has 2 divisors, whose sum is σ = 42820353482. Its totient is φ = 42820353480.

The previous prime is 42820353479. The next prime is 42820353503. The reversal of 42820353481 is 18435302824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35900775625 + 6919577856 = 189475^2 + 83184^2 .

It is a cyclic number.

It is not a de Polignac number, because 42820353481 - 2¹ = 42820353479 is a prime.

It is a super-2 number, since 2×42820353481² (a number of 22 digits) contains 22 as substring.

Together with 42820353479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42820353781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21410176740 + 21410176741.

It is an arithmetic number, because the mean of its divisors is an integer number (21410176741).

Almost surely, 2^42820353481 is an apocalyptic number.

It is an amenable number.

42820353481 is a deficient number, since it is larger than the sum of its proper divisors (1).

42820353481 is an equidigital number, since it uses as much as digits as its factorization.

42820353481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 42820353481 in words is "forty-two billion, eight hundred twenty million, three hundred fifty-three thousand, four hundred eighty-one".