42521140 has 36 divisors (see below), whose sum is σ = 91832076. Its totient is φ = 16538112.

The previous prime is 42521117. The next prime is 42521153. The reversal of 42521140 is 4112524.

It can be written as a sum of positive squares in 6 ways, for example, as 996004 + 41525136 = 998^2 + 6444^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26604 + ... + 28156.

It is an arithmetic number, because the mean of its divisors is an integer number (2550891).

Almost surely, 2^42521140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42521140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45916038).

42521140 is an abundant number, since it is smaller than the sum of its proper divisors (49310936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42521140 is a wasteful number, since it uses less digits than its factorization.

42521140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1597 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42521140 is about 6520.8235676178. The cubic root of 42521140 is about 349.0344544436.

Adding to 42521140 its reverse (4112524), we get a palindrome (46633664).

The spelling of 42521140 in words is "forty-two million, five hundred twenty-one thousand, one hundred forty".