210001121200 has 60 divisors (see below), whose sum is σ = 543337529728. Its totient is φ = 77538873600.

The previous prime is 210001121189. The next prime is 210001121201. The reversal of 210001121200 is 2121100012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (210001121201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20187216 + ... + 20197615.

Almost surely, 2^210001121200 is an apocalyptic number.

210001121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001121200 is an abundant number, since it is smaller than the sum of its proper divisors (333336408528).

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

210001121200 is a wasteful number, since it uses less digits than its factorization.

210001121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40384862 (or 40384851 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210001121200 its reverse (2121100012), we get a palindrome (212122221212).

The spelling of 210001121200 in words is "two hundred ten billion, one million, one hundred twenty-one thousand, two hundred".