42121110521 has 8 divisors (see below), whose sum is σ = 48140138880. Its totient is φ = 36102513888.

The previous prime is 42121110509. The next prime is 42121110539. The reversal of 42121110521 is 12501112124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42121110521 - 2³⁴ = 24941241337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42121110493 and 42121110502.

It is not an unprimeable number, because it can be changed into a prime (42121110821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138725 + ... + 321693.

It is an arithmetic number, because the mean of its divisors is an integer number (6017517360).

Almost surely, 2^42121110521 is an apocalyptic number.

It is an amenable number.

42121110521 is a deficient number, since it is larger than the sum of its proper divisors (6019028359).

42121110521 is a wasteful number, since it uses less digits than its factorization.

42121110521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215863.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 42121110521 its reverse (12501112124), we get a palindrome (54622222645).

The spelling of 42121110521 in words is "forty-two billion, one hundred twenty-one million, one hundred ten thousand, five hundred twenty-one".