21001000100210 has 32 divisors (see below), whose sum is σ = 41083113844080. Its totient is φ = 7683075825408.

The previous prime is 21001000100191. The next prime is 21001000100233. The reversal of 21001000100210 is 1200100010012.

It can be written as a sum of positive squares in 8 ways, for example, as 10951155418009 + 10049844682201 = 3309253^2 + 3170149^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 741023237 + ... + 741051576.

Almost surely, 2^{21001000100210} is an apocalyptic number.

21001000100210 is a deficient number, since it is larger than the sum of its proper divisors (20082113743870).

21001000100210 is a wasteful number, since it uses less digits than its factorization.

21001000100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482074942.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21001000100210 its reverse (1200100010012), we get a palindrome (22201100110222).

The spelling of 21001000100210 in words is "twenty-one trillion, one billion, one hundred thousand, two hundred ten".