21040401305 has 96 divisors (see below), whose sum is σ = 34268925312. Its totient is φ = 12219648000.

The previous prime is 21040401293. The next prime is 21040401329. The reversal of 21040401305 is 50310404012.

It is not a de Polignac number, because 21040401305 - 2¹⁰ = 21040400281 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4625042 + ... + 4629588.

It is an arithmetic number, because the mean of its divisors is an integer number (356967972).

Almost surely, 2^21040401305 is an apocalyptic number.

It is an amenable number.

21040401305 is a deficient number, since it is larger than the sum of its proper divisors (13228524007).

21040401305 is a wasteful number, since it uses less digits than its factorization.

21040401305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695 (or 4688 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21040401305 its reverse (50310404012), we get a palindrome (71350805317).

The spelling of 21040401305 in words is "twenty-one billion, forty million, four hundred one thousand, three hundred five".