42280521 has 16 divisors (see below), whose sum is σ = 59313600. Its totient is φ = 26750528.

The previous prime is 42280517. The next prime is 42280523. The reversal of 42280521 is 12508224.

It is not a de Polignac number, because 42280521 - 2² = 42280517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42280491 and 42280500.

It is not an unprimeable number, because it can be changed into a prime (42280523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015 + ... + 9251.

It is an arithmetic number, because the mean of its divisors is an integer number (3707100).

Almost surely, 2^42280521 is an apocalyptic number.

It is an amenable number.

42280521 is a deficient number, since it is larger than the sum of its proper divisors (17033079).

42280521 is a wasteful number, since it uses less digits than its factorization.

42280521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8328.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 42280521 is about 6502.3473453823. The cubic root of 42280521 is about 348.3748355781.

Adding to 42280521 its reverse (12508224), we get a palindrome (54788745).

The spelling of 42280521 in words is "forty-two million, two hundred eighty thousand, five hundred twenty-one".