42085247721 has 16 divisors (see below), whose sum is σ = 61820998848. Its totient is φ = 25253672000.

The previous prime is 42085247689. The next prime is 42085247767. The reversal of 42085247721 is 12774258024.

It is a cyclic number.

It is not a de Polignac number, because 42085247721 - 2⁵ = 42085247689 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42085247791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6310086 + ... + 6316751.

It is an arithmetic number, because the mean of its divisors is an integer number (3863812428).

Almost surely, 2^42085247721 is an apocalyptic number.

It is an amenable number.

42085247721 is a deficient number, since it is larger than the sum of its proper divisors (19735751127).

42085247721 is a wasteful number, since it uses less digits than its factorization.

42085247721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12626952.

The product of its (nonzero) digits is 250880, while the sum is 42.

The spelling of 42085247721 in words is "forty-two billion, eighty-five million, two hundred forty-seven thousand, seven hundred twenty-one".