21110002110 has 240 divisors, whose sum is σ = 62264315520. Its totient is φ = 5125524480.

The previous prime is 21110002063. The next prime is 21110002157. The reversal of 21110002110 is 1120001112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21110002063) and next prime (21110002157).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21110002092 and 21110002101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 7255336 + ... + 7258244.

It is an arithmetic number, because the mean of its divisors is an integer number (259434648).

Almost surely, 2^21110002110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110002110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31132157760).

21110002110 is an abundant number, since it is smaller than the sum of its proper divisors (41154313410).

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

21110002110 is a wasteful number, since it uses less digits than its factorization.

21110002110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993 (or 2967 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21110002110 its reverse (1120001112), we get a palindrome (22230003222).

The spelling of 21110002110 in words is "twenty-one billion, one hundred ten million, two thousand, one hundred ten".