21103021110 has 32 divisors (see below), whose sum is σ = 50653618272. Its totient is φ = 5626764800.

The previous prime is 21103021097. The next prime is 21103021193. The reversal of 21103021110 is 1112030112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225310 + ... + 304910.

It is an arithmetic number, because the mean of its divisors is an integer number (1582925571).

Almost surely, 2^21103021110 is an apocalyptic number.

21103021110 is an abundant number, since it is smaller than the sum of its proper divisors (29550597162).

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

21103021110 is a wasteful number, since it uses less digits than its factorization.

21103021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88448.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21103021110 its reverse (1112030112), we get a palindrome (22215051222).

The spelling of 21103021110 in words is "twenty-one billion, one hundred three million, twenty-one thousand, one hundred ten".