42450521 has 4 divisors (see below), whose sum is σ = 42493200. Its totient is φ = 42407844.

The previous prime is 42450517. The next prime is 42450533. The reversal of 42450521 is 12505424.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42450521 - 2² = 42450517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42410521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19811 + ... + 21848.

It is an arithmetic number, because the mean of its divisors is an integer number (10623300).

Almost surely, 2^42450521 is an apocalyptic number.

It is an amenable number.

42450521 is a deficient number, since it is larger than the sum of its proper divisors (42679).

42450521 is a wasteful number, since it uses less digits than its factorization.

42450521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42678.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42450521 is about 6515.4064339840. The cubic root of 42450521 is about 348.8411222006.

Adding to 42450521 its reverse (12505424), we get a palindrome (54955945).

The spelling of 42450521 in words is "forty-two million, four hundred fifty thousand, five hundred twenty-one".