21011210010 has 192 divisors, whose sum is σ = 68980833792. Its totient is φ = 4323483648.

The previous prime is 21011209997. The next prime is 21011210023. The reversal of 21011210010 is 1001211012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21011209997) and next prime (21011210023).

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 = 21011209974 and 21011210001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 203682 + ... + 288978.

It is an arithmetic number, because the mean of its divisors is an integer number (359275176).

Almost surely, 2^21011210010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011210010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34490416896).

21011210010 is an abundant number, since it is smaller than the sum of its proper divisors (47969623782).

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

21011210010 is a wasteful number, since it uses less digits than its factorization.

21011210010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85357 (or 85354 counting only the distinct ones).

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

Adding to 21011210010 its reverse (1001211012), we get a palindrome (22012421022).

The spelling of 21011210010 in words is "twenty-one billion, eleven million, two hundred ten thousand, ten".