42004121525 has 12 divisors (see below), whose sum is σ = 52798607652. Its totient is φ = 33142976640.

The previous prime is 42004121521. The next prime is 42004121567. The reversal of 42004121525 is 52512140024.

42004121525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 119224561 + 41884896964 = 10919^2 + 204658^2 .

It is not a de Polignac number, because 42004121525 - 2² = 42004121521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42004121494 and 42004121503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42004121521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11506154 + ... + 11509803.

It is an arithmetic number, because the mean of its divisors is an integer number (4399883971).

Almost surely, 2^42004121525 is an apocalyptic number.

It is an amenable number.

42004121525 is a deficient number, since it is larger than the sum of its proper divisors (10794486127).

42004121525 is a wasteful number, since it uses less digits than its factorization.

42004121525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23016040 (or 23016035 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 42004121525 its reverse (52512140024), we get a palindrome (94516261549).

The spelling of 42004121525 in words is "forty-two billion, four million, one hundred twenty-one thousand, five hundred twenty-five".