21444144131421 has 20 divisors (see below), whose sum is σ = 34946012660064. Its totient is φ = 12996450988200.

The previous prime is 21444144131411. The next prime is 21444144131429. The reversal of 21444144131421 is 12413144144412.

21444144131421 is a `hidden beast` number, since 2 + 1 + 4 + 441 + 44 + 131 + 42 + 1 = 666.

It is not a de Polignac number, because 21444144131421 - 2⁹ = 21444144130909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444144131429) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12033750025 + ... + 12033751806.

Almost surely, 2^{21444144131421} is an apocalyptic number.

It is an amenable number.

21444144131421 is a deficient number, since it is larger than the sum of its proper divisors (13501868528643).

21444144131421 is a wasteful number, since it uses less digits than its factorization.

21444144131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24067501854 (or 24067501845 counting only the distinct ones).

The product of its digits is 49152, while the sum is 36.

Adding to 21444144131421 its reverse (12413144144412), we get a palindrome (33857288275833).

The spelling of 21444144131421 in words is "twenty-one trillion, four hundred forty-four billion, one hundred forty-four million, one hundred thirty-one thousand, four hundred twenty-one".