21221212000210 has 16 divisors (see below), whose sum is σ = 38198774367936. Its totient is φ = 8488353073968.

The previous prime is 21221212000181. The next prime is 21221212000213. The reversal of 21221212000210 is 1200021212212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21221212000213) 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, 15787812 + ... + 17079151.

It is an arithmetic number, because the mean of its divisors is an integer number (2387423397996).

Almost surely, 2^{21221212000210} is an apocalyptic number.

21221212000210 is a deficient number, since it is larger than the sum of its proper divisors (16977562367726).

21221212000210 is a wasteful number, since it uses less digits than its factorization.

21221212000210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32931537.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221212000210 its reverse (1200021212212), we get a palindrome (22421233212422).

The spelling of 21221212000210 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred ten", and thus it is an aban number.