21015046106 has 8 divisors (see below), whose sum is σ = 31523944500. Its totient is φ = 10507064608.

The previous prime is 21015046097. The next prime is 21015046109. The reversal of 21015046106 is 60164051012.

It can be written as a sum of positive squares in 2 ways, for example, as 21011952025 + 3094081 = 144955^2 + 1759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21015046109) 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 3 ways as a sum of consecutive naturals, for example, 168731 + ... + 265518.

Almost surely, 2^21015046106 is an apocalyptic number.

21015046106 is a deficient number, since it is larger than the sum of its proper divisors (10508898394).

21015046106 is a wasteful number, since it uses less digits than its factorization.

21015046106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458448.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 21015046106 its reverse (60164051012), we get a palindrome (81179097118).

The spelling of 21015046106 in words is "twenty-one billion, fifteen million, forty-six thousand, one hundred six".