42705554821 has 2 divisors, whose sum is σ = 42705554822. Its totient is φ = 42705554820.

The previous prime is 42705554807. The next prime is 42705554849. The reversal of 42705554821 is 12845550724.

42705554821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31404801796 + 11300753025 = 177214^2 + 106305^2 .

It is a cyclic number.

It is not a de Polignac number, because 42705554821 - 2⁵ = 42705554789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42705554851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21352777410 + 21352777411.

It is an arithmetic number, because the mean of its divisors is an integer number (21352777411).

Almost surely, 2^42705554821 is an apocalyptic number.

It is an amenable number.

42705554821 is a deficient number, since it is larger than the sum of its proper divisors (1).

42705554821 is an equidigital number, since it uses as much as digits as its factorization.

42705554821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448000, while the sum is 43.

The spelling of 42705554821 in words is "forty-two billion, seven hundred five million, five hundred fifty-four thousand, eight hundred twenty-one".