21011001020210 has 16 divisors (see below), whose sum is σ = 37819905096600. Its totient is φ = 8404377461376.

The previous prime is 21011001020203. The next prime is 21011001020213. The reversal of 21011001020210 is 1202010011012.

It can be written as a sum of positive squares in 4 ways, for example, as 11370094009849 + 9640907010361 = 3371957^2 + 3104981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21011001020191 and 21011001020200.

It is not an unprimeable number, because it can be changed into a prime (21011001020213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1260356 + ... + 6603824.

Almost surely, 2^{21011001020210} is an apocalyptic number.

21011001020210 is a deficient number, since it is larger than the sum of its proper divisors (16808904076390).

21011001020210 is a wasteful number, since it uses less digits than its factorization.

21011001020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736685.

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

Adding to 21011001020210 its reverse (1202010011012), we get a palindrome (22213011031222).

The spelling of 21011001020210 in words is "twenty-one trillion, eleven billion, one million, twenty thousand, two hundred ten".