21442544220101 has 4 divisors (see below), whose sum is σ = 21442565460204. Its totient is φ = 21442522980000.

The previous prime is 21442544220089. The next prime is 21442544220103. The reversal of 21442544220101 is 10102244524412.

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 13820914087201 + 7621630132900 = 3717649^2 + 2760730^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442544220101 - 2¹⁰ = 21442544219077 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 (21442544220103) 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, 9026000 + ... + 11151401.

It is an arithmetic number, because the mean of its divisors is an integer number (5360641365051).

Almost surely, 2^{21442544220101} is an apocalyptic number.

It is an amenable number.

21442544220101 is a deficient number, since it is larger than the sum of its proper divisors (21240103).

21442544220101 is a wasteful number, since it uses less digits than its factorization.

21442544220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21240102.

The product of its (nonzero) digits is 20480, while the sum is 32.

Adding to 21442544220101 its reverse (10102244524412), we get a palindrome (31544788744513).

The spelling of 21442544220101 in words is "twenty-one trillion, four hundred forty-two billion, five hundred forty-four million, two hundred twenty thousand, one hundred one".