21389474213 has 16 divisors (see below), whose sum is σ = 22116492720. Its totient is φ = 20672870400.

The previous prime is 21389474207. The next prime is 21389474237. The reversal of 21389474213 is 31247498312.

It can be written as a sum of positive squares in 8 ways, for example, as 2903808769 + 18485665444 = 53887^2 + 135962^2 .

It is a cyclic number.

It is not a de Polignac number, because 21389474213 - 2⁶ = 21389474149 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 (21389444213) 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, 2922803 + ... + 2930111.

It is an arithmetic number, because the mean of its divisors is an integer number (1382280795).

Almost surely, 2^21389474213 is an apocalyptic number.

It is an amenable number.

21389474213 is a deficient number, since it is larger than the sum of its proper divisors (727018507).

21389474213 is a wasteful number, since it uses less digits than its factorization.

21389474213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8008.

The product of its digits is 290304, while the sum is 44.

The spelling of 21389474213 in words is "twenty-one billion, three hundred eighty-nine million, four hundred seventy-four thousand, two hundred thirteen".