210021220210 has 16 divisors (see below), whose sum is σ = 378064815192.
Its totient is φ = 84002572800.
The previous prime is 210021220193. The next prime is 210021220229. The reversal of 210021220210 is 12022120012.
It is a happy number.
It can be written as a sum of positive squares in 4 ways, for example, as 38094061329 + 171927158881 = 195177^2 + 414641^2
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 7 ways as a sum of consecutive naturals, for example, 588831 + ... + 875650.
Almost surely, 2210021220210 is an apocalyptic number.
210021220210 is a deficient number, since it is larger than the sum of its proper divisors (168043594982).
210021220210 is a wasteful number, since it uses less digits than its factorization.
210021220210 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1478829.
The product of its (nonzero) digits is 32, while the sum is 13.
Adding to 210021220210 its reverse (12022120012), we get a palindrome (222043340222).
The spelling of 210021220210 in words is "two hundred ten billion, twenty-one million, two hundred twenty thousand, two hundred ten".