21521030200210 has 16 divisors (see below), whose sum is σ = 38738647603800. Its totient is φ = 8608235803776.

The previous prime is 21521030200193. The next prime is 21521030200211. The reversal of 21521030200210 is 1200203012512.

It can be written as a sum of positive squares in 4 ways, for example, as 16200455950441 + 5320574249769 = 4024979^2 + 2306637^2 .

It is not an unprimeable number, because it can be changed into a prime (21521030200211) 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, 21521205 + ... + 22498984.

Almost surely, 2^{21521030200210} is an apocalyptic number.

21521030200210 is a deficient number, since it is larger than the sum of its proper divisors (17217617403590).

21521030200210 is a wasteful number, since it uses less digits than its factorization.

21521030200210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44069085.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21521030200210 its reverse (1200203012512), we get a palindrome (22721233212722).

The spelling of 21521030200210 in words is "twenty-one trillion, five hundred twenty-one billion, thirty million, two hundred thousand, two hundred ten".