42125211120521 has 4 divisors (see below), whose sum is σ = 42125358699012. Its totient is φ = 42125063542032.

The previous prime is 42125211120397. The next prime is 42125211120541. The reversal of 42125211120521 is 12502111252124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37076359409296 + 5048851711225 = 6089036^2 + 2246965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42125211120521 is a prime.

It is a super-2 number, since 2×42125211120521² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42125211120541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73360250 + ... + 73932243.

It is an arithmetic number, because the mean of its divisors is an integer number (10531339674753).

Almost surely, 2^{42125211120521} is an apocalyptic number.

It is an amenable number.

42125211120521 is a deficient number, since it is larger than the sum of its proper divisors (147578491).

42125211120521 is a wasteful number, since it uses less digits than its factorization.

42125211120521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147578490.

The product of its (nonzero) digits is 3200, while the sum is 29.

Adding to 42125211120521 its reverse (12502111252124), we get a palindrome (54627322372645).

The spelling of 42125211120521 in words is "forty-two trillion, one hundred twenty-five billion, two hundred eleven million, one hundred twenty thousand, five hundred twenty-one".