21210110010 has 160 divisors (see below), whose sum is σ = 61412281920. Its totient is φ = 5232895488.

The previous prime is 21210110003. The next prime is 21210110011. The reversal of 21210110010 is 1001101212.

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 = 21210109974 and 21210110001.

It is not an unprimeable number, because it can be changed into a prime (21210110011) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 799377 + ... + 825483.

It is an arithmetic number, because the mean of its divisors is an integer number (383826762).

Almost surely, 2^21210110010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210110010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30706140960).

21210110010 is an abundant number, since it is smaller than the sum of its proper divisors (40202171910).

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

21210110010 is a wasteful number, since it uses less digits than its factorization.

21210110010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26202 (or 26193 counting only the distinct ones).

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

Adding to 21210110010 its reverse (1001101212), we get a palindrome (22211211222).

It can be divided in two parts, 212101 and 10010, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 21210110010 in words is "twenty-one billion, two hundred ten million, one hundred ten thousand, ten".