42244430021 has 4 divisors (see below), whose sum is σ = 42477824844. Its totient is φ = 42011035200.

The previous prime is 42244430009. The next prime is 42244430023. The reversal of 42244430021 is 12003444224.

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 14325696100 + 27918733921 = 119690^2 + 167089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42244430021 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 (42244430023) 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, 116697140 + ... + 116697501.

It is an arithmetic number, because the mean of its divisors is an integer number (10619456211).

Almost surely, 2^42244430021 is an apocalyptic number.

It is an amenable number.

42244430021 is a deficient number, since it is larger than the sum of its proper divisors (233394823).

42244430021 is a wasteful number, since it uses less digits than its factorization.

42244430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233394822.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 42244430021 its reverse (12003444224), we get a palindrome (54247874245).

The spelling of 42244430021 in words is "forty-two billion, two hundred forty-four million, four hundred thirty thousand, twenty-one".