42221424 has 40 divisors (see below), whose sum is σ = 124654720. Its totient is φ = 12063168.

The previous prime is 42221407. The next prime is 42221437. The reversal of 42221424 is 42412224.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 42221424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62494 + ... + 63165.

It is an arithmetic number, because the mean of its divisors is an integer number (3116368).

Almost surely, 2^42221424 is an apocalyptic number.

It is an amenable number.

42221424 is an abundant number, since it is smaller than the sum of its proper divisors (82433296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42221424 is a wasteful number, since it uses less digits than its factorization.

42221424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125677 (or 125671 counting only the distinct ones).

The product of its digits is 1024, while the sum is 21.

The square root of 42221424 is about 6497.8014743450. The cubic root of 42221424 is about 348.2124478971.

Adding to 42221424 its reverse (42412224), we get a palindrome (84633648).

The spelling of 42221424 in words is "forty-two million, two hundred twenty-one thousand, four hundred twenty-four".