42432120312721 has 2 divisors, whose sum is σ = 42432120312722. Its totient is φ = 42432120312720.

The previous prime is 42432120312677. The next prime is 42432120312727. The reversal of 42432120312721 is 12721302123424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24315392172096 + 18116728140625 = 4931064^2 + 4256375^2 .

It is a cyclic number.

It is not a de Polignac number, because 42432120312721 - 2³³ = 42423530378129 is a prime.

It is a super-3 number, since 3×42432120312721³ (a number of 42 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (42432120312727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21216060156360 + 21216060156361.

It is an arithmetic number, because the mean of its divisors is an integer number (21216060156361).

Almost surely, 2^{42432120312721} is an apocalyptic number.

It is an amenable number.

42432120312721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42432120312721 is an equidigital number, since it uses as much as digits as its factorization.

42432120312721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 42432120312721 in words is "forty-two trillion, four hundred thirty-two billion, one hundred twenty million, three hundred twelve thousand, seven hundred twenty-one".