21201100210210 has 16 divisors (see below), whose sum is σ = 38181929174136. Its totient is φ = 8476007018368.

The previous prime is 21201100210201. The next prime is 21201100210217. The reversal of 21201100210210 is 1201200110212.

It can be written as a sum of positive squares in 4 ways, for example, as 20878475074209 + 322625136001 = 4569297^2 + 568001^2 .

It is not an unprimeable number, because it can be changed into a prime (21201100210217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554113129 + ... + 554151388.

Almost surely, 2^{21201100210210} is an apocalyptic number.

21201100210210 is a deficient number, since it is larger than the sum of its proper divisors (16980828963926).

21201100210210 is a wasteful number, since it uses less digits than its factorization.

21201100210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108266437.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201100210210 its reverse (1201200110212), we get a palindrome (22402300320422).

The spelling of 21201100210210 in words is "twenty-one trillion, two hundred one billion, one hundred million, two hundred ten thousand, two hundred ten".