42605122522621 has 2 divisors, whose sum is σ = 42605122522622. Its totient is φ = 42605122522620.

The previous prime is 42605122522619. The next prime is 42605122522663. The reversal of 42605122522621 is 12622522150624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40852371595396 + 1752750927225 = 6391586^2 + 1323915^2 .

It is a cyclic number.

It is not a de Polignac number, because 42605122522621 - 2¹ = 42605122522619 is a prime.

Together with 42605122522619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42605122522691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21302561261310 + 21302561261311.

It is an arithmetic number, because the mean of its divisors is an integer number (21302561261311).

Almost surely, 2^{42605122522621} is an apocalyptic number.

It is an amenable number.

42605122522621 is a deficient number, since it is larger than the sum of its proper divisors (1).

42605122522621 is an equidigital number, since it uses as much as digits as its factorization.

42605122522621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 42605122522621 in words is "forty-two trillion, six hundred five billion, one hundred twenty-two million, five hundred twenty-two thousand, six hundred twenty-one".