21442244141 has 8 divisors (see below), whose sum is σ = 22183274520. Its totient is φ = 20701323328.

The previous prime is 21442244137. The next prime is 21442244179. The reversal of 21442244141 is 14144224412.

It can be written as a sum of positive squares in 4 ways, for example, as 792100 + 21441452041 = 890^2 + 146429^2 .

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 21442244141 - 2² = 21442244137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442244441) 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, 686435 + ... + 716991.

It is an arithmetic number, because the mean of its divisors is an integer number (2772909315).

Almost surely, 2^21442244141 is an apocalyptic number.

It is an amenable number.

21442244141 is a deficient number, since it is larger than the sum of its proper divisors (741030379).

21442244141 is a wasteful number, since it uses less digits than its factorization.

21442244141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54783.

The product of its digits is 8192, while the sum is 29.

Adding to 21442244141 its reverse (14144224412), we get a palindrome (35586468553).

The spelling of 21442244141 in words is "twenty-one billion, four hundred forty-two million, two hundred forty-four thousand, one hundred forty-one".