21106101006 has 24 divisors (see below), whose sum is σ = 46173869040. Its totient is φ = 6967061856.

The previous prime is 21106100989. The next prime is 21106101017. The reversal of 21106101006 is 60010160112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 21106101006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5690191 + ... + 5693898.

It is an arithmetic number, because the mean of its divisors is an integer number (1923911210).

Almost surely, 2^21106101006 is an apocalyptic number.

21106101006 is an abundant number, since it is smaller than the sum of its proper divisors (25067768034).

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

21106101006 is a wasteful number, since it uses less digits than its factorization.

21106101006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11384200 (or 11384197 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21106101006 its reverse (60010160112), we get a palindrome (81116261118).

The spelling of 21106101006 in words is "twenty-one billion, one hundred six million, one hundred one thousand, six".