210121202220200 has 24 divisors (see below), whose sum is σ = 488531795162430. Its totient is φ = 84048480888000.

The previous prime is 210121202220199. The next prime is 210121202220239. The reversal of 210121202220200 is 2022202121012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 78300447352516 + 131820754867684 = 8848754^2 + 11481322^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 525303005351 + ... + 525303005750.

Almost surely, 2^{210121202220200} is an apocalyptic number.

210121202220200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121202220200 is an abundant number, since it is smaller than the sum of its proper divisors (278410592942230).

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

210121202220200 is a wasteful number, since it uses less digits than its factorization.

210121202220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050606011117 (or 1050606011108 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 210121202220200 its reverse (2022202121012), we get a palindrome (212143404341212).

The spelling of 210121202220200 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty thousand, two hundred".