21010423206 has 16 divisors (see below), whose sum is σ = 42029964144. Its totient is φ = 7001954784.

The previous prime is 21010423201. The next prime is 21010423243. The reversal of 21010423206 is 60232401012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010423201) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 349765 + ... + 405408.

It is an arithmetic number, because the mean of its divisors is an integer number (2626872759).

Almost surely, 2^21010423206 is an apocalyptic number.

21010423206 is an abundant number, since it is smaller than the sum of its proper divisors (21019540938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010423206 is a wasteful number, since it uses less digits than its factorization.

21010423206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759815.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21010423206 its reverse (60232401012), we get a palindrome (81242824218).

The spelling of 21010423206 in words is "twenty-one billion, ten million, four hundred twenty-three thousand, two hundred six".