21120001110 has 96 divisors (see below), whose sum is σ = 59189483808. Its totient is φ = 5194068480.

The previous prime is 21120001103. The next prime is 21120001127. The reversal of 21120001110 is 1110002112.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21120001092 and 21120001101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1388245 + ... + 1403375.

It is an arithmetic number, because the mean of its divisors is an integer number (616557123).

Almost surely, 2^21120001110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120001110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29594741904).

21120001110 is an abundant number, since it is smaller than the sum of its proper divisors (38069482698).

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

21120001110 is a wasteful number, since it uses less digits than its factorization.

21120001110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16350 (or 16347 counting only the distinct ones).

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

Adding to 21120001110 its reverse (1110002112), we get a palindrome (22230003222).

The spelling of 21120001110 in words is "twenty-one billion, one hundred twenty million, one thousand, one hundred ten".