42510221 has 8 divisors (see below), whose sum is σ = 45851064. Its totient is φ = 39179520.

The previous prime is 42510211. The next prime is 42510241. The reversal of 42510221 is 12201524.

It can be written as a sum of positive squares in 4 ways, for example, as 972196 + 41538025 = 986^2 + 6445^2 .

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 42510221 - 2¹⁴ = 42493837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42510221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42510211) 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, 7745 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (5731383).

Almost surely, 2^42510221 is an apocalyptic number.

It is an amenable number.

42510221 is a deficient number, since it is larger than the sum of its proper divisors (3340843).

42510221 is a wasteful number, since it uses less digits than its factorization.

42510221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 42510221 is about 6519.9862729917. The cubic root of 42510221 is about 349.0045757098.

Adding to 42510221 its reverse (12201524), we get a palindrome (54711745).

The spelling of 42510221 in words is "forty-two million, five hundred ten thousand, two hundred twenty-one".