42301521 has 20 divisors (see below), whose sum is σ = 63407872. Its totient is φ = 28104408.

The previous prime is 42301499. The next prime is 42301537. The reversal of 42301521 is 12510324.

It is not a de Polignac number, because 42301521 - 2⁵ = 42301489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42301494 and 42301503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42301591) 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 19 ways as a sum of consecutive naturals, for example, 29016 + ... + 30438.

Almost surely, 2^42301521 is an apocalyptic number.

It is an amenable number.

42301521 is a deficient number, since it is larger than the sum of its proper divisors (21106351).

42301521 is a wasteful number, since it uses less digits than its factorization.

42301521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802 (or 1793 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42301521 is about 6503.9619463831. The cubic root of 42301521 is about 348.4325032738.

Adding to 42301521 its reverse (12510324), we get a palindrome (54811845).

The spelling of 42301521 in words is "forty-two million, three hundred one thousand, five hundred twenty-one".