21000302010 has 96 divisors (see below), whose sum is σ = 56845311120. Its totient is φ = 5374024704.

The previous prime is 21000302009. The next prime is 21000302027. The reversal of 21000302010 is 1020300012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8643978729 + 12356323281 = 92973^2 + 111159^2 .

It is a super-2 number, since 2×21000302010² (a number of 21 digits) contains 22 as substring.

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 = 21000301983 and 21000302001.

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, 199896 + ... + 286284.

Almost surely, 2^21000302010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000302010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28422655560).

21000302010 is an abundant number, since it is smaller than the sum of its proper divisors (35845009110).

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

21000302010 is a wasteful number, since it uses less digits than its factorization.

21000302010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86512 (or 86509 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21000302010 its reverse (1020300012), we get a palindrome (22020602022).

The spelling of 21000302010 in words is "twenty-one billion, three hundred two thousand, ten".