11423431444221 has 12 divisors (see below), whose sum is σ = 16611253779900. Its totient is φ = 7564509411840.

The previous prime is 11423431444199. The next prime is 11423431444223. The reversal of 11423431444221 is 12244413432411.

11423431444221 is a `hidden beast` number, since 1 + 1 + 42 + 343 + 14 + 44 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2639682584100 + 8783748860121 = 1624710^2 + 2963739^2 .

It is not a de Polignac number, because 11423431444221 - 2⁵ = 11423431444189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11423431444223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4259294500 + ... + 4259297181.

It is an arithmetic number, because the mean of its divisors is an integer number (1384271148325).

Almost surely, 2^{11423431444221} is an apocalyptic number.

It is an amenable number.

11423431444221 is a deficient number, since it is larger than the sum of its proper divisors (5187822335679).

11423431444221 is a wasteful number, since it uses less digits than its factorization.

11423431444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518591836 (or 8518591833 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

Adding to 11423431444221 its reverse (12244413432411), we get a palindrome (23667844876632).

The spelling of 11423431444221 in words is "eleven trillion, four hundred twenty-three billion, four hundred thirty-one million, four hundred forty-four thousand, two hundred twenty-one".