21010110101210 has 8 divisors (see below), whose sum is σ = 37818198182196. Its totient is φ = 8404044040480.

The previous prime is 21010110101179. The next prime is 21010110101237. The reversal of 21010110101210 is 1210101101012.

It can be written as a sum of positive squares in 2 ways, for example, as 20033940413041 + 976169688169 = 4475929^2 + 988013^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21010110101191 and 21010110101200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050505505051 + ... + 1050505505070.

Almost surely, 2^{21010110101210} is an apocalyptic number.

21010110101210 is a deficient number, since it is larger than the sum of its proper divisors (16808088080986).

21010110101210 is a wasteful number, since it uses less digits than its factorization.

21010110101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101011010128.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21010110101210 its reverse (1210101101012), we get a palindrome (22220211202222).

The spelling of 21010110101210 in words is "twenty-one trillion, ten billion, one hundred ten million, one hundred one thousand, two hundred ten".