42244621 has 4 divisors (see below), whose sum is σ = 42270172. Its totient is φ = 42219072.

The previous prime is 42244603. The next prime is 42244627. The reversal of 42244621 is 12644224.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15515721 + 26728900 = 3939^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 42244621 - 2⁹ = 42244109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42244627) 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, 10110 + ... + 13663.

It is an arithmetic number, because the mean of its divisors is an integer number (10567543).

Almost surely, 2^42244621 is an apocalyptic number.

It is an amenable number.

42244621 is a deficient number, since it is larger than the sum of its proper divisors (25551).

42244621 is a wasteful number, since it uses less digits than its factorization.

42244621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25550.

The product of its digits is 3072, while the sum is 25.

The square root of 42244621 is about 6499.5862175988. The cubic root of 42244621 is about 348.2762070392.

Adding to 42244621 its reverse (12644224), we get a palindrome (54888845).

The spelling of 42244621 in words is "forty-two million, two hundred forty-four thousand, six hundred twenty-one".