21115651106 has 8 divisors (see below), whose sum is σ = 34552883664. Its totient is φ = 9598023220.

The previous prime is 21115651103. The next prime is 21115651157. The reversal of 21115651106 is 60115651112.

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

It is not an unprimeable number, because it can be changed into a prime (21115651103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479901140 + ... + 479901183.

It is an arithmetic number, because the mean of its divisors is an integer number (4319110458).

Almost surely, 2^21115651106 is an apocalyptic number.

21115651106 is a deficient number, since it is larger than the sum of its proper divisors (13437232558).

21115651106 is a wasteful number, since it uses less digits than its factorization.

21115651106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959802336.

The product of its (nonzero) digits is 1800, while the sum is 29.

It can be divided in two parts, 211156 and 51106, that added together give a palindrome (262262).

The spelling of 21115651106 in words is "twenty-one billion, one hundred fifteen million, six hundred fifty-one thousand, one hundred six".