42521142077 has 2 divisors, whose sum is σ = 42521142078. Its totient is φ = 42521142076.

The previous prime is 42521142071. The next prime is 42521142151. The reversal of 42521142077 is 77024112524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40896568441 + 1624573636 = 202229^2 + 40306^2 .

It is a cyclic number.

It is not a de Polignac number, because 42521142077 - 2¹⁴ = 42521125693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42521142071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260571038 + 21260571039.

It is an arithmetic number, because the mean of its divisors is an integer number (21260571039).

Almost surely, 2^42521142077 is an apocalyptic number.

It is an amenable number.

42521142077 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521142077 is an equidigital number, since it uses as much as digits as its factorization.

42521142077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 35.

The spelling of 42521142077 in words is "forty-two billion, five hundred twenty-one million, one hundred forty-two thousand, seventy-seven".