21404440101 has 16 divisors (see below), whose sum is σ = 32772349440. Its totient is φ = 12289630320.

The previous prime is 21404440073. The next prime is 21404440181. The reversal of 21404440101 is 10104440412.

It is not a de Polignac number, because 21404440101 - 2⁵ = 21404440069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404440181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17068305 + ... + 17069558.

It is an arithmetic number, because the mean of its divisors is an integer number (2048271840).

Almost surely, 2^21404440101 is an apocalyptic number.

It is an amenable number.

21404440101 is a deficient number, since it is larger than the sum of its proper divisors (11367909339).

21404440101 is a wasteful number, since it uses less digits than its factorization.

21404440101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34137896.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21404440101 its reverse (10104440412), we get a palindrome (31508880513).

The spelling of 21404440101 in words is "twenty-one billion, four hundred four million, four hundred forty thousand, one hundred one".