42134454721 has 2 divisors, whose sum is σ = 42134454722. Its totient is φ = 42134454720.

The previous prime is 42134454679. The next prime is 42134454751. The reversal of 42134454721 is 12745443124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39945618496 + 2188836225 = 199864^2 + 46785^2 .

It is a cyclic number.

It is not a de Polignac number, because 42134454721 - 2¹¹ = 42134452673 is a prime.

It is not a weakly prime, because it can be changed into another prime (42134454751) 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, 21067227360 + 21067227361.

It is an arithmetic number, because the mean of its divisors is an integer number (21067227361).

Almost surely, 2^42134454721 is an apocalyptic number.

It is an amenable number.

42134454721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42134454721 is an equidigital number, since it uses as much as digits as its factorization.

42134454721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 37.

Adding to 42134454721 its reverse (12745443124), we get a palindrome (54879897845).

The spelling of 42134454721 in words is "forty-two billion, one hundred thirty-four million, four hundred fifty-four thousand, seven hundred twenty-one".