42224021 has 8 divisors (see below), whose sum is σ = 50354304. Its totient is φ = 34618320.

The previous prime is 42223997. The next prime is 42224033. The reversal of 42224021 is 12042224.

It is a happy number.

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 42224021 - 2⁶ = 42223957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42224041) 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, 130970 + ... + 131291.

It is an arithmetic number, because the mean of its divisors is an integer number (6294288).

Almost surely, 2^42224021 is an apocalyptic number.

It is an amenable number.

42224021 is a deficient number, since it is larger than the sum of its proper divisors (8130283).

42224021 is a wasteful number, since it uses less digits than its factorization.

42224021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262291.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42224021 is about 6498.0013080947. The cubic root of 42224021 is about 348.2195871573.

Subtracting from 42224021 its sum of digits (17), we obtain a square (42224004 = 6498²).

Adding to 42224021 its reverse (12042224), we get a palindrome (54266245).

The spelling of 42224021 in words is "forty-two million, two hundred twenty-four thousand, twenty-one".