42521253 has 8 divisors (see below), whose sum is σ = 56867616. Its totient is φ = 28261200.

The previous prime is 42521249. The next prime is 42521291. The reversal of 42521253 is 35212524.

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

It is not a de Polignac number, because 42521253 - 2² = 42521249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20418 + ... + 22403.

It is an arithmetic number, because the mean of its divisors is an integer number (7108452).

Almost surely, 2^42521253 is an apocalyptic number.

It is an amenable number.

42521253 is a deficient number, since it is larger than the sum of its proper divisors (14346363).

42521253 is a wasteful number, since it uses less digits than its factorization.

42521253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43155.

The product of its digits is 2400, while the sum is 24.

The square root of 42521253 is about 6520.8322321618. The cubic root of 42521253 is about 349.0347636299.

Adding to 42521253 its reverse (35212524), we get a palindrome (77733777).

The spelling of 42521253 in words is "forty-two million, five hundred twenty-one thousand, two hundred fifty-three".