21084439301 has 4 divisors (see below), whose sum is σ = 21086347692. Its totient is φ = 21082530912.

The previous prime is 21084439291. The next prime is 21084439333. The reversal of 21084439301 is 10393448012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 678602500 + 20405836801 = 26050^2 + 142849^2 .

It is a cyclic number.

It is not a de Polignac number, because 21084439301 - 2⁶ = 21084439237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21084439801) 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, 937526 + ... + 959751.

It is an arithmetic number, because the mean of its divisors is an integer number (5271586923).

Almost surely, 2^21084439301 is an apocalyptic number.

It is an amenable number.

21084439301 is a deficient number, since it is larger than the sum of its proper divisors (1908391).

21084439301 is a wasteful number, since it uses less digits than its factorization.

21084439301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908390.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21084439301 in words is "twenty-one billion, eighty-four million, four hundred thirty-nine thousand, three hundred one".