210221212112 has 20 divisors (see below), whose sum is σ = 407455830756. Its totient is φ = 105071320320.

The previous prime is 210221212081. The next prime is 210221212181. The reversal of 210221212112 is 211212122012.

It can be written as a sum of positive squares in 2 ways, for example, as 81523954576 + 128697257536 = 285524^2 + 358744^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2411189 + ... + 2496852.

Almost surely, 2^210221212112 is an apocalyptic number.

It is an amenable number.

210221212112 is a deficient number, since it is larger than the sum of its proper divisors (197234618644).

210221212112 is a wasteful number, since it uses less digits than its factorization.

210221212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910726 (or 4910720 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210221212112 its reverse (211212122012), we get a palindrome (421433334124).

The spelling of 210221212112 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twelve".