21404144101 has 4 divisors (see below), whose sum is σ = 21418937632. Its totient is φ = 21389350572.

The previous prime is 21404144033. The next prime is 21404144141. The reversal of 21404144101 is 10144140412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21404144101 - 2⁷ = 21404143973 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 (21404144141) 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, 7394595 + ... + 7397488.

It is an arithmetic number, because the mean of its divisors is an integer number (5354734408).

Almost surely, 2^21404144101 is an apocalyptic number.

It is an amenable number.

21404144101 is a deficient number, since it is larger than the sum of its proper divisors (14793531).

21404144101 is a wasteful number, since it uses less digits than its factorization.

21404144101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14793530.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21404144101 its reverse (10144140412), we get a palindrome (31548284513).

The spelling of 21404144101 in words is "twenty-one billion, four hundred four million, one hundred forty-four thousand, one hundred one".