21201100110 has 64 divisors (see below), whose sum is σ = 57380140800. Its totient is φ = 5569239456.

The previous prime is 21201100091. The next prime is 21201100111. The reversal of 21201100110 is 1100110212.

It is a happy number.

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 = 21201100092 and 21201100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201100111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 567900 + ... + 604079.

It is an arithmetic number, because the mean of its divisors is an integer number (896564700).

Almost surely, 2^21201100110 is an apocalyptic number.

21201100110 is an abundant number, since it is smaller than the sum of its proper divisors (36179040690).

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

21201100110 is a wasteful number, since it uses less digits than its factorization.

21201100110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172062 (or 1172056 counting only the distinct ones).

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

Adding to 21201100110 its reverse (1100110212), we get a palindrome (22301210322).

The spelling of 21201100110 in words is "twenty-one billion, two hundred one million, one hundred thousand, one hundred ten".