21440550110201 has 4 divisors (see below), whose sum is σ = 21637252404900. Its totient is φ = 21243847815504.

The previous prime is 21440550110141. The next prime is 21440550110339. The reversal of 21440550110201 is 10201105504412.

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 10287087607801 + 11153462502400 = 3207349^2 + 3339680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21440550110201 is a prime.

It is a super-2 number, since 2×21440550110201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440550110701) 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, 98351147186 + ... + 98351147403.

It is an arithmetic number, because the mean of its divisors is an integer number (5409313101225).

Almost surely, 2^{21440550110201} is an apocalyptic number.

It is an amenable number.

21440550110201 is a deficient number, since it is larger than the sum of its proper divisors (196702294699).

21440550110201 is a wasteful number, since it uses less digits than its factorization.

21440550110201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196702294698.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 21440550110201 its reverse (10201105504412), we get a palindrome (31641655614613).

The spelling of 21440550110201 in words is "twenty-one trillion, four hundred forty billion, five hundred fifty million, one hundred ten thousand, two hundred one".