42121433531 has 4 divisors (see below), whose sum is σ = 42221484864. Its totient is φ = 42021382200.

The previous prime is 42121433449. The next prime is 42121433561. The reversal of 42121433531 is 13533412124.

42121433531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42121433531 - 2¹⁴ = 42121417147 is a prime.

It is a super-2 number, since 2×42121433531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42121433494 and 42121433503.

It is not an unprimeable number, because it can be changed into a prime (42121433561) 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, 50025035 + ... + 50025876.

It is an arithmetic number, because the mean of its divisors is an integer number (10555371216).

Almost surely, 2^42121433531 is an apocalyptic number.

42121433531 is a deficient number, since it is larger than the sum of its proper divisors (100051333).

42121433531 is a wasteful number, since it uses less digits than its factorization.

42121433531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100051332.

The product of its digits is 8640, while the sum is 29.

Adding to 42121433531 its reverse (13533412124), we get a palindrome (55654845655).

The spelling of 42121433531 in words is "forty-two billion, one hundred twenty-one million, four hundred thirty-three thousand, five hundred thirty-one".