21012110210 has 64 divisors (see below), whose sum is σ = 47002056192. Its totient is φ = 6585394176.

The previous prime is 21012110209. The next prime is 21012110257. The reversal of 21012110210 is 1201121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012110191 and 21012110200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18359 + ... + 205818.

It is an arithmetic number, because the mean of its divisors is an integer number (734407128).

Almost surely, 2^21012110210 is an apocalyptic number.

21012110210 is an abundant number, since it is smaller than the sum of its proper divisors (25989945982).

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

21012110210 is a wasteful number, since it uses less digits than its factorization.

21012110210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224307.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21012110210 its reverse (1201121012), we get a palindrome (22213231222).

The spelling of 21012110210 in words is "twenty-one billion, twelve million, one hundred ten thousand, two hundred ten".