42234243521 has 4 divisors (see below), whose sum is σ = 42279706500. Its totient is φ = 42188780544.

The previous prime is 42234243509. The next prime is 42234243559. The reversal of 42234243521 is 12534243224.

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 2196234496 + 40038009025 = 46864^2 + 200095^2 .

It is a cyclic number.

It is not a de Polignac number, because 42234243521 - 2²² = 42230049217 is a prime.

It is a super-2 number, since 2×42234243521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42234246521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22730096 + ... + 22731953.

It is an arithmetic number, because the mean of its divisors is an integer number (10569926625).

Almost surely, 2^42234243521 is an apocalyptic number.

It is an amenable number.

42234243521 is a deficient number, since it is larger than the sum of its proper divisors (45462979).

42234243521 is an equidigital number, since it uses as much as digits as its factorization.

42234243521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45462978.

The product of its digits is 46080, while the sum is 32.

Adding to 42234243521 its reverse (12534243224), we get a palindrome (54768486745).

The spelling of 42234243521 in words is "forty-two billion, two hundred thirty-four million, two hundred forty-three thousand, five hundred twenty-one".