42810722721 has 20 divisors (see below), whose sum is σ = 68871192852. Its totient is φ = 26345059488.

The previous prime is 42810722701. The next prime is 42810722723. The reversal of 42810722721 is 12722701824.

42810722721 is a `hidden beast` number, since 428 + 1 + 0 + 7 + 227 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1786245696 + 41024477025 = 42264^2 + 202545^2 .

It is not a de Polignac number, because 42810722721 - 2⁷ = 42810722593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42810722723) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20326926 + ... + 20329031.

Almost surely, 2^42810722721 is an apocalyptic number.

It is an amenable number.

42810722721 is a deficient number, since it is larger than the sum of its proper divisors (26060470131).

42810722721 is a wasteful number, since it uses less digits than its factorization.

42810722721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40655982 (or 40655973 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The spelling of 42810722721 in words is "forty-two billion, eight hundred ten million, seven hundred twenty-two thousand, seven hundred twenty-one".