210121211200 has 84 divisors (see below), whose sum is σ = 520454140192. Its totient is φ = 83491776000.

The previous prime is 210121211189. The next prime is 210121211207. The reversal of 210121211200 is 2112121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121211207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193254 + ... + 676453.

Almost surely, 2^210121211200 is an apocalyptic number.

210121211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121211200 is an abundant number, since it is smaller than the sum of its proper divisors (310332928992).

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

210121211200 is a wasteful number, since it uses less digits than its factorization.

210121211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869880 (or 869865 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210121211200 its reverse (2112121012), we get a palindrome (212233332212).

The spelling of 210121211200 in words is "two hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, two hundred".