42203521 has 8 divisors (see below), whose sum is σ = 43043624. Its totient is φ = 41368320.

The previous prime is 42203479. The next prime is 42203527. The reversal of 42203521 is 12530224.

It can be written as a sum of positive squares in 4 ways, for example, as 18496 + 42185025 = 136^2 + 6495^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 42203521 - 2⁷ = 42203393 is a prime.

It is a super-2 number, since 2×42203521² = 3562274369594882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42203527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19531 + ... + 21583.

It is an arithmetic number, because the mean of its divisors is an integer number (5380453).

Almost surely, 2^42203521 is an apocalyptic number.

It is an amenable number.

42203521 is a deficient number, since it is larger than the sum of its proper divisors (840103).

42203521 is a wasteful number, since it uses less digits than its factorization.

42203521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 42203521 is about 6496.4237084722. The cubic root of 42203521 is about 348.1632238445.

Adding to 42203521 its reverse (12530224), we get a palindrome (54733745).

It can be divided in two parts, 42203 and 521, that added together give a palindrome (42724).

The spelling of 42203521 in words is "forty-two million, two hundred three thousand, five hundred twenty-one".