21103303110 has 64 divisors (see below), whose sum is σ = 51971673600. Its totient is φ = 5480933120.

The previous prime is 21103303099. The next prime is 21103303139. The reversal of 21103303110 is 1130330112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21103303110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 722449 + ... + 751091.

It is an arithmetic number, because the mean of its divisors is an integer number (812057400).

Almost surely, 2^21103303110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103303110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25985836800).

21103303110 is an abundant number, since it is smaller than the sum of its proper divisors (30868370490).

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

21103303110 is a wasteful number, since it uses less digits than its factorization.

21103303110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29293.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21103303110 its reverse (1130330112), we get a palindrome (22233633222).

The spelling of 21103303110 in words is "twenty-one billion, one hundred three million, three hundred three thousand, one hundred ten".