42133216521 has 24 divisors (see below), whose sum is σ = 61819357600. Its totient is φ = 25506169920.

The previous prime is 42133216519. The next prime is 42133216523. The reversal of 42133216521 is 12561233124.

It is an interprime number because it is at equal distance from previous prime (42133216519) and next prime (42133216523).

It is not a de Polignac number, because 42133216521 - 2¹ = 42133216519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42133216523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254805 + ... + 386253.

Almost surely, 2^42133216521 is an apocalyptic number.

It is an amenable number.

42133216521 is a deficient number, since it is larger than the sum of its proper divisors (19686141079).

42133216521 is a wasteful number, since it uses less digits than its factorization.

42133216521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132357 (or 132346 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

Adding to 42133216521 its reverse (12561233124), we get a palindrome (54694449645).

The spelling of 42133216521 in words is "forty-two billion, one hundred thirty-three million, two hundred sixteen thousand, five hundred twenty-one".