42400155721 has 32 divisors (see below), whose sum is σ = 53391310848. Its totient is φ = 32709277440.

The previous prime is 42400155671. The next prime is 42400155757. The reversal of 42400155721 is 12755100424.

It is not a de Polignac number, because 42400155721 - 2⁷ = 42400155593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42400155121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9455746 + ... + 9460228.

It is an arithmetic number, because the mean of its divisors is an integer number (1668478464).

Almost surely, 2^42400155721 is an apocalyptic number.

It is an amenable number.

42400155721 is a deficient number, since it is larger than the sum of its proper divisors (10991155127).

42400155721 is a wasteful number, since it uses less digits than its factorization.

42400155721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5701.

The product of its (nonzero) digits is 11200, while the sum is 31.

The spelling of 42400155721 in words is "forty-two billion, four hundred million, one hundred fifty-five thousand, seven hundred twenty-one".