42535131221 has 8 divisors (see below), whose sum is σ = 46458352704. Its totient is φ = 38621308320.

The previous prime is 42535131173. The next prime is 42535131251. The reversal of 42535131221 is 12213153524.

42535131221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42535131221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42535131251) 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, 2340176 + ... + 2358281.

It is an arithmetic number, because the mean of its divisors is an integer number (5807294088).

Almost surely, 2^42535131221 is an apocalyptic number.

It is an amenable number.

42535131221 is a deficient number, since it is larger than the sum of its proper divisors (3923221483).

42535131221 is a wasteful number, since it uses less digits than its factorization.

42535131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699291.

The product of its digits is 7200, while the sum is 29.

Adding to 42535131221 its reverse (12213153524), we get a palindrome (54748284745).

The spelling of 42535131221 in words is "forty-two billion, five hundred thirty-five million, one hundred thirty-one thousand, two hundred twenty-one".