21011020010210 has 16 divisors (see below), whose sum is σ = 37820159436600. Its totient is φ = 8404336133376.

The previous prime is 21011020010177. The next prime is 21011020010263. The reversal of 21011020010210 is 1201002011012.

It can be written as a sum of positive squares in 4 ways, for example, as 10135990261849 + 10875029748361 = 3183707^2 + 3297731^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21011020010191 and 21011020010200.

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 7 ways as a sum of consecutive naturals, for example, 7747895 + ... + 10102074.

Almost surely, 2^{21011020010210} is an apocalyptic number.

21011020010210 is a deficient number, since it is larger than the sum of its proper divisors (16809139426390).

21011020010210 is a wasteful number, since it uses less digits than its factorization.

21011020010210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17967685.

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

Adding to 21011020010210 its reverse (1201002011012), we get a palindrome (22212022021222).

The spelling of 21011020010210 in words is "twenty-one trillion, eleven billion, twenty million, ten thousand, two hundred ten".