210121221220200 has 96 divisors (see below), whose sum is σ = 723750873110400. Its totient is φ = 56032325657280.

The previous prime is 210121221220133. The next prime is 210121221220201. The reversal of 210121221220200 is 2022122121012.

It is a happy number.

210121221220200 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 21 + 221 + 220 + 200 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (210121221220201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19455663232 + ... + 19455674031.

It is an arithmetic number, because the mean of its divisors is an integer number (7539071594900).

Almost surely, 2^{210121221220200} is an apocalyptic number.

210121221220200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121221220200 is an abundant number, since it is smaller than the sum of its proper divisors (513629651890200).

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

210121221220200 is a wasteful number, since it uses less digits than its factorization.

210121221220200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38911337288 (or 38911337273 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210121221220200 its reverse (2022122121012), we get a palindrome (212143343341212).

The spelling of 210121221220200 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred".