21210120210 has 32 divisors (see below), whose sum is σ = 53898659712. Its totient is φ = 5323324160.

The previous prime is 21210120209. The next prime is 21210120257. The reversal of 21210120210 is 1202101212.

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, 20793726 + ... + 20794745.

It is an arithmetic number, because the mean of its divisors is an integer number (1684333116).

Almost surely, 2^21210120210 is an apocalyptic number.

21210120210 is an abundant number, since it is smaller than the sum of its proper divisors (32688539502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210120210 is a wasteful number, since it uses less digits than its factorization.

21210120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41588498.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210120210 its reverse (1202101212), we get a palindrome (22412221422).

It can be divided in two parts, 212101202 and 10, that added together give a palindrome (212101212).

The spelling of 21210120210 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, two hundred ten".