42444144221 has 8 divisors (see below), whose sum is σ = 43772169144. Its totient is φ = 41125639680.

The previous prime is 42444144217. The next prime is 42444144227. The reversal of 42444144221 is 12244144424.

It can be written as a sum of positive squares in 4 ways, for example, as 5728219225 + 36715924996 = 75685^2 + 191614^2 .

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 42444144221 - 2² = 42444144217 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 (42444144227) 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, 2371040 + ... + 2388873.

It is an arithmetic number, because the mean of its divisors is an integer number (5471521143).

Almost surely, 2^42444144221 is an apocalyptic number.

It is an amenable number.

42444144221 is a deficient number, since it is larger than the sum of its proper divisors (1328024923).

42444144221 is a wasteful number, since it uses less digits than its factorization.

42444144221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4760191.

The product of its digits is 32768, while the sum is 32.

Adding to 42444144221 its reverse (12244144424), we get a palindrome (54688288645).

The spelling of 42444144221 in words is "forty-two billion, four hundred forty-four million, one hundred forty-four thousand, two hundred twenty-one".