21001110210 has 96 divisors (see below), whose sum is σ = 57681149760. Its totient is φ = 5286674304.

The previous prime is 21001110209. The next prime is 21001110223. The reversal of 21001110210 is 1201110012.

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 = 21001110192 and 21001110201.

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, 462232 + ... + 505628.

It is an arithmetic number, because the mean of its divisors is an integer number (600845310).

Almost surely, 2^21001110210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21001110210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28840574880).

21001110210 is an abundant number, since it is smaller than the sum of its proper divisors (36680039550).

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

21001110210 is a wasteful number, since it uses less digits than its factorization.

21001110210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43712 (or 43709 counting only the distinct ones).

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

Adding to 21001110210 its reverse (1201110012), we get a palindrome (22202220222).

The spelling of 21001110210 in words is "twenty-one billion, one million, one hundred ten thousand, two hundred ten".