21421441134401 has 24 divisors (see below), whose sum is σ = 27199014361920. Its totient is φ = 16682914936800.

The previous prime is 21421441134377. The next prime is 21421441134403. The reversal of 21421441134401 is 10443114412412.

It is not a de Polignac number, because 21421441134401 - 2¹⁴ = 21421441118017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421441134403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9865886 + ... + 11839703.

It is an arithmetic number, because the mean of its divisors is an integer number (1133292265080).

Almost surely, 2^{21421441134401} is an apocalyptic number.

It is an amenable number.

21421441134401 is a deficient number, since it is larger than the sum of its proper divisors (5777573227519).

21421441134401 is a wasteful number, since it uses less digits than its factorization.

21421441134401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21707445 (or 21707438 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

Adding to 21421441134401 its reverse (10443114412412), we get a palindrome (31864555546813).

The spelling of 21421441134401 in words is "twenty-one trillion, four hundred twenty-one billion, four hundred forty-one million, one hundred thirty-four thousand, four hundred one".